diff --git a/README.md b/README.md
index c9354db..c5dc2dd 100644
--- a/README.md
+++ b/README.md
@@ -27,6 +27,9 @@ requests are accepted on GitHub.
 
 # Example
 
+See the [eg/](https://git.kirsle.net/go/ui/src/branch/master/eg) directory
+in this git repository for several example programs and screenshots.
+
 ```go
 package main
 
diff --git a/eg/README.md b/eg/README.md
index 5ab58e6..c6887b5 100644
--- a/eg/README.md
+++ b/eg/README.md
@@ -1,10 +1,16 @@
 # Examples for go/ui
 
-* [Hello, World!](hello-world/): a basic UI demo.
-* [Frame Place()](frame-place/): demonstrates using the Place() layout management
-  option for Frame widgets.]
+Here are some example programs using go/ui, each accompanied by a
+screenshot and description:
+
+* [Hello, World!](hello-world/): a basic UI demo with a Label and a
+  Button.
+* [Frame Place()](frame-place/): demonstrates using the Place() layout
+  management option for Frame widgets.
 * [Window Manager](windows/): demonstrates the Window widget and window
   management features of the Supervisor.
 * [Tooltip](tooltip/): demonstrates the Tooltip widget on a variety of buttons
   scattered around the window.
 * [Menus](menus/): demonstrates various Menu Buttons and a Menu Bar.
+* [Themes](themes/): a UI demo that shows off the Default, Flat, and Dark UI
+  themes as part of experimental theming support.
diff --git a/eg/frame-place/main.go b/eg/frame-place/main.go
index ad1419d..4886b7e 100644
--- a/eg/frame-place/main.go
+++ b/eg/frame-place/main.go
@@ -134,8 +134,9 @@ func CreateButtons(window *ui.MainWindow, parent *ui.Frame) {
 		}))
 
 		// When clicked, change the window title to ID this button.
-		button.Handle(ui.Click, func(ed ui.EventData) {
+		button.Handle(ui.Click, func(ed ui.EventData) error {
 			window.SetTitle(parent.Name + ": " + setting.Label)
+			return nil
 		})
 
 		parent.Place(button, setting.Place)
diff --git a/eg/hello-world/README.md b/eg/hello-world/README.md
new file mode 100644
index 0000000..b01e639
--- /dev/null
+++ b/eg/hello-world/README.md
@@ -0,0 +1,11 @@
+# Hello World
+
+![Screenshot](screenshot.png)
+
+A simple Hello World featuring a Label and a Button. The button logs
+to the console window when clicked.
+
+## Running It
+
+From your terminal, just type `go run main.go` from this
+example's directory.
diff --git a/eg/hello-world/main.go b/eg/hello-world/main.go
index c6ae838..a448163 100644
--- a/eg/hello-world/main.go
+++ b/eg/hello-world/main.go
@@ -44,8 +44,9 @@ func main() {
 			Padding:      4,
 		},
 	}))
-	button.Handle(ui.Click, func(ed ui.EventData) {
+	button.Handle(ui.Click, func(ed ui.EventData) error {
 		fmt.Println("I've been clicked!")
+		return nil
 	})
 	mw.Pack(button, ui.Pack{
 		Side: ui.N,
diff --git a/eg/hello-world/screenshot.png b/eg/hello-world/screenshot.png
new file mode 100644
index 0000000..eca253b
Binary files /dev/null and b/eg/hello-world/screenshot.png differ
diff --git a/eg/layout/layout.go b/eg/layout/layout.go
deleted file mode 100644
index 511c885..0000000
--- a/eg/layout/layout.go
+++ /dev/null
@@ -1,7 +0,0 @@
-package layout
-
-import "fmt"
-
-func main() {
-	fmt.Println("Hello world")
-}
diff --git a/eg/layout/main.go b/eg/layout/main.go
deleted file mode 100644
index 8f99a7c..0000000
--- a/eg/layout/main.go
+++ /dev/null
@@ -1,12 +0,0 @@
-package main
-
-import (
-	"fmt"
-
-	"git.kirsle.net/go/ui/eg/layout"
-)
-
-func main() {
-	fmt.Println("Hello world")
-	layout.main()
-}
diff --git a/eg/menus/README.md b/eg/menus/README.md
index d80001f..11822d6 100644
--- a/eg/menus/README.md
+++ b/eg/menus/README.md
@@ -1,5 +1,7 @@
 # Menu Example
 
+![Screenshot](screenshot.png)
+
 This example shows off the Menu, MenuButton, and MenuBar widgets.
 
 * MenuButton is your basic button that pops up a Menu when clicked.
diff --git a/eg/menus/screenshot.png b/eg/menus/screenshot.png
new file mode 100644
index 0000000..3c055ac
Binary files /dev/null and b/eg/menus/screenshot.png differ
diff --git a/eg/themes/README.md b/eg/themes/README.md
new file mode 100644
index 0000000..999fe4f
--- /dev/null
+++ b/eg/themes/README.md
@@ -0,0 +1,13 @@
+# Themes Example
+
+![Screenshot](screenshot.png)
+
+This demo shows off experimental UI theme support.
+
+The main menu bar lets you open a Window with widgets all using a
+selected theme.
+
+## Running It
+
+From your terminal, just type `go run main.go` or `make run` from this
+example's directory.
diff --git a/eg/themes/screenshot.png b/eg/themes/screenshot.png
new file mode 100644
index 0000000..fa903db
Binary files /dev/null and b/eg/themes/screenshot.png differ
diff --git a/eg/tooltip/README.md b/eg/tooltip/README.md
new file mode 100644
index 0000000..9081890
--- /dev/null
+++ b/eg/tooltip/README.md
@@ -0,0 +1,10 @@
+# Tooltips Demo
+
+![Screenshot](screenshot.png)
+
+A screen full of buttons having different Tooltip properties.
+
+## Running It
+
+From your terminal, just type `go run main.go` from this
+example's directory.
diff --git a/eg/tooltip/main.go b/eg/tooltip/main.go
index 005a209..5c8664d 100644
--- a/eg/tooltip/main.go
+++ b/eg/tooltip/main.go
@@ -132,8 +132,9 @@ func CreateButtons(window *ui.MainWindow, parent *ui.Frame) {
 		}))
 
 		// When clicked, change the window title to ID this button.
-		button.Handle(ui.Click, func(ed ui.EventData) {
+		button.Handle(ui.Click, func(ed ui.EventData) error {
 			window.SetTitle(parent.Name + ": " + setting.Label)
+			return nil
 		})
 
 		// Tooltip for it.
diff --git a/eg/tooltip/screenshot.png b/eg/tooltip/screenshot.png
new file mode 100644
index 0000000..4eda807
Binary files /dev/null and b/eg/tooltip/screenshot.png differ
diff --git a/eg/windows/README.md b/eg/windows/README.md
new file mode 100644
index 0000000..d8b75b6
--- /dev/null
+++ b/eg/windows/README.md
@@ -0,0 +1,11 @@
+# Windows Demo
+
+![Screenshot](screenshot.png)
+
+This demo lets you open a bunch of Window widgets that can be moved
+around, overlapped, and closed.
+
+## Running It
+
+From your terminal, just type `go run main.go` from this
+example's directory.
diff --git a/eg/windows/screenshot.png b/eg/windows/screenshot.png
new file mode 100644
index 0000000..4b5dd74
Binary files /dev/null and b/eg/windows/screenshot.png differ
diff --git a/go.mod b/go.mod
index 0f7fa2d..6c9025f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,8 +2,8 @@ module git.kirsle.net/go/ui
 
 go 1.13
 
-replace git.kirsle.net/go/render => /home/kirsle/go/src/git.kirsle.net/go/render
-
 require (
-	git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d
+	git.kirsle.net/go/render v0.0.0-20210104010442-b4a1979a8ba1
+	github.com/veandco/go-sdl2 v0.4.7 // indirect
+	golang.org/x/image v0.0.0-20210504121937-7319ad40d33e // indirect
 )
diff --git a/go.sum b/go.sum
index 6f64f01..277cb31 100644
--- a/go.sum
+++ b/go.sum
@@ -3,6 +3,8 @@ cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMT
 cloud.google.com/go v0.37.4/go.mod h1:NHPJ89PdicEuT9hdPXMROBD91xc5uRDxsMtSB16k7hw=
 git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d h1:vErak6oVRT2dosyQzcwkjXyWQ2NRIVL8q9R8NOUTtsg=
 git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d/go.mod h1:ywZtC+zE2SpeObfkw0OvG01pWHQadsVQ4WDKOYzaejc=
+git.kirsle.net/go/render v0.0.0-20210104010442-b4a1979a8ba1 h1:wGQLjBnWvqx7rU43yFG8ow4rnYqUMUwqorEkxdPaJ6Q=
+git.kirsle.net/go/render v0.0.0-20210104010442-b4a1979a8ba1/go.mod h1:ss7pvZbGWrMaDuZwyUTjV9+T0AJwAkxZZHwMFsvHrkk=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/Shopify/sarama v1.19.0/go.mod h1:FVkBWblsNy7DGZRfXLU0O9RCGt5g3g3yEuWXgklEdEo=
 github.com/Shopify/toxiproxy v2.1.4+incompatible/go.mod h1:OXgGpZ6Cli1/URJOF1DMxUHB2q5Ap20/P/eIdh4G0pI=
@@ -95,6 +97,8 @@ github.com/tomnomnom/xtermcolor v0.0.0-20160428124646-b78803f00a7e/go.mod h1:fSI
 github.com/urfave/negroni v1.0.0/go.mod h1:Meg73S6kFm/4PpbYdq35yYWoCZ9mS/YSx+lKnmiohz4=
 github.com/veandco/go-sdl2 v0.4.1 h1:HmSBvVmKWI8LAOeCfTTM8R33rMyPcs6U3o8n325c9Qg=
 github.com/veandco/go-sdl2 v0.4.1/go.mod h1:FB+kTpX9YTE+urhYiClnRzpOXbiWgaU3+5F2AB78DPg=
+github.com/veandco/go-sdl2 v0.4.7 h1:VfpCM+LfEGDbHdByglCo2bcBsevjFvzl8W0f6VLNitg=
+github.com/veandco/go-sdl2 v0.4.7/go.mod h1:OROqMhHD43nT4/i9crJukyVecjPNYYuCofep6SNiAjY=
 go.opencensus.io v0.20.1/go.mod h1:6WKK9ahsWS3RSO+PY9ZHZUfv2irvY6gN279GOPZjmmk=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
@@ -105,6 +109,8 @@ golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL
 golang.org/x/image v0.0.0-20180708004352-c73c2afc3b81/go.mod h1:ux5Hcp/YLpHSI86hEcLt0YII63i6oz57MZXIpbrjZUs=
 golang.org/x/image v0.0.0-20200119044424-58c23975cae1 h1:5h3ngYt7+vXCDZCup/HkCQgW5XwmSvR/nA2JmJ0RErg=
 golang.org/x/image v0.0.0-20200119044424-58c23975cae1/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
+golang.org/x/image v0.0.0-20210504121937-7319ad40d33e h1:PzJMNfFQx+QO9hrC1GwZ4BoPGeNGhfeQEgcQFArEjPk=
+golang.org/x/image v0.0.0-20210504121937-7319ad40d33e/go.mod h1:FeLwcggjj3mMvU+oOTbSwawSJRM1uh48EjtB4UJZlP0=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190301231843-5614ed5bae6f/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=