Here are a few from me. I've included color and greyscale versions and I had an idea that you might make the greyscale version the standard version and show the color version on mouse over. Just an idea.
I wish I had more time for this one because I'm a total 80's NUT. Even my e-mail address shows it.
If I take another break from work later I'll see what I can come up with.
Glad I didn't go with the Rubix Cube idea, as I see someone just did it while I was working on my entry. Hehe.