I'm not normally in the habit of posting this sort of thing but I do own a number of these MicroServers and they're great for home lab use. They may only take up to 8Gb RAM and have single, dual-core chips in them but they don't eat much power and don't make much noise. They're also as “cheap as chips” to buy!
Enough about why I have them. ServersPlus are running a competition of sorts to design a cosmetically pimped up MicroServer. If you submit what becomes the winning design you get the first one of the batch for free.
Submissions have to be in on 11th November and voting runs until 30th November.