LiquidCanvas can be used to draw all sorts of graphics without any actual images, such as drop shadows, rounded corners, gradients, borders, and shapes. The developer’s demo page shows a lot of examples.
I’ve seen a lot of forum posts discuss how the plugin looks great in Firefox and IE8, but fails to render in IE6 and IE7. If you are here looking for a LiquidCanvas fix for IE6 and IE7, it’s included in this post. You’ll kick yourself at how easy the fix is.