This sounds deliciously likely to annoy museums that claim ownership of visitor pictures of public-domain works: the Britain Loves Wikipedia event…

“is a scavenger hunt and free content photography contest running in museums and cultural institutions across the UK through February 2010. The aim is to increase the number of pictures available to illustrate Wikipedia articles, and to inspire new articles […] you can go to most museums on your own at any time during the month.”

And if you have a camera that takes macro close-ups, I might also suggest hunting down a few of the pre-1926 art books in your university library — since the images will likely count as being in the public domain in the USA, and thus be able to slip past the increasingly snotty wikipolice on Wikipedia.