Lots of nice ideas/designs appearing in this thread.
I think I will plow ahead with a decent sticker as a low cost solution. The skins are nice but more expensive than I would like.

Haven't had time to try out Jambalah designs actually on a mini (sorry about that Jambalah). I've been too busy taking Mac minis apart and running hardware tests, re-installing OS X etc.

Slightly off topic:
Opened up a 1.25ghz model to find a spider had been living inside it! Quite a lot of cobwebs inside and the dead body of the spider itself. The machine runs well though. Another mini I bought non-functional, I've managed to get running. Airport card seems to have been the main problem and the combi drive is buggered. When I got it booted up the first time I had the very nice surprise to discover it's a 1.5ghz, 64mb VRAM model rather than the 1.42ghz model that it was advertised as.
I paid ?56 plus shipping for it, what a bargain!