Question: what can do with a raspberry pi?
Answer: Mod My Pi. Mod My Pi do a great range of colourful cases, using state of the art injection moulding techniques, and they're not a bad price either.
Make your own Pi case. Fancy making your own case? ... 
Living room PC. ... 
A mini Web browser. ... 
ZX Spectrum Pi. ... 
Retro Pi. ... 
Arcade Pi. ... 
Windows 3.0 on a Pi.