If changing your startup screen on the Mac appeals to your artistic side, or you just need something fun to do today, Jim Hamm sends us these simple instructions from Kibbles & Bytes newsletter #650.
There's no Terminal commands involved. It works with 10.5 Leopard and 10.6 Snow Leopard. Of course, you need to be the admin user in order to make these changes. It sounds like it's applicable back to 10.2, but the name and location are different. Let us know if you try it out.