Fine Art Adoption Network
This MetaFilter post tipped me off to the existance of the Fine Art Adoption Network, a site that lets you choose a work of art and look after it, assuming the artist likes the cut of your gib and you can afford the shipping costs.
On a whim, I signed up and had a look around - most of the work available is, without wishing to be rude, total mince. But I found a small sculpture I liked, and that fits in with the stuff I already have (I have things that involve text, diagrams and systematic marks), and I'm now in the process of having it shipped over from the US.
FAAN is definitely worth a look if you want to have some art in your house but, well, don't want to spend any money, or don't have any money to spend.