Made with GIMP 1.2. This almost didn't make it onto the site. It's basically a bunch of gradients, scribbling with various brushes (vines, flares, crosses...), and scaled down. I have another version of it which may go up sometime, too...
I originally made this at poster size, so it mostly needs some touch up before it could theoretically be a poster. However, I am not sure if people would like to see it as a poster - so please mail me if you do...I'll see what I can do!