Shuttle's tiny K45 is great for your grandma, kitchen, or anything really
It should be mighty cheap, too — boxes start at $99, or the price you pay for the black paint on your MacBook. If you get a Drobo (also boxy) you can sit them next to each other and they’ll look like siblings. I’d invest in a bigger PSU, though. The default 100W sounds a little weak.
Shuttle announces K45 mini-PC barebone, and systems shipping with Linux [Digitimes, via TechFresh]