Some cool css images images:
Safari 4 breaks images across CSS columns

Image by And all that Malarkey
Safari 4 breaks images across CSS columns (Firefox does not)
section.content-main {
-moz-column-count : 3;
-moz-column-gap : 80px;
-moz-column-rule : 1px solid rgb(204,203,191);
-o-column-width : 220px;
-o-column-gap : 80px;
-o-column-rule : 1px solid rgb(204,203,191);
-webkit-column-count : 3;
-webkit-column-gap : 80px;
-webkit-column-rule : 1px solid rgb(204,203,191);
column-column-count : 3;
column-gap : 80px;
column-rule : 1px solid rgb(204,203,191); }
Google Search Page with Styles Disabled Reveals CSS Sprites

Image by schoschie
I had left styles disabled by accident (from the Develop menu in Safari 4) and was surprised to see that Google apparently uses CSS sprites on its search page.
The sprite image in question is here:
www.google.com/images/nav_logo4.png
css-miami-desktop

Image by geirarne
A perfect desktop image for CSS developers