JellyBean hangs out in Harley's converted Apple Two-Page Monochrome Monitor, which has been repurposed into a cat bed. I removed the CRT, circuit boards, and added the towel and some catnip. Click on the photo for some comments on its flickr page. This was also covered on the Make Blog: Monitor Cat bed (Make Blog).
Since this is Harley's monitor, you're probably looking for a picture of Harley. here she is, using the cat bed for its intended purpose.
This is better than a macquarium anyday!
Related: More pictures of the The Evil Mad Scientist Laboratories Feline Auxiliary
Evil Mad Scientist Laboratories
http://www.evilmadscientist.com/article.php/20060619144000619