Updated after several years. I've just reshaped a new container around the content that was originally here when I first established this site back in the 90's.
What I used to have to do with crazy browser detecting PHP, frames and whatever is now simple JavaScript.
You can change the background amongst the several options using the menu on the left. The backgrounds are a bit dated I'll admit, but still interesting. Feel free to use them, or indeed any of various code bits found here. They are all provided under the Creative Commons BSD license.