I have just started modding my PS2 Slimline with a crystal case.
It's looking good at the moment, but will look the balls when the blue 3mm LED's are finally wired up to the USB's properly. There aren't any lights running for the moment, but I'll obviously update as and when I get them fitted up and running!
The crystal case came from eBay, £11.99 with free postage, so it's generally not too bad at all! I'll be starting to modify a NDS Lite shortly aswell. I may even start selling pre-modified consoles ect on eBay!