We'll all be glancing over there now.
Here are the basic points to remember (this from a conversation once with an art professor and an art historian I go to church with):
1. anything that is not original is not going to be worth much, so skip over the prints. They would both rather decorate their homes with originals that have no monetary value by unknowns than with high quality prints of the masters.
2. Most of the original stuff you find will be pretty obviously junk, amateur, high school art class work, somebody's grandma.
3. Occasionally you'll find something that isn't eliminated by these two criteria. At that point, you're on your own. The iphone won't even help you on really old stuff, because signing the painting wasn't SOP until I think the 19th century. You'll just have to decide if you want to risk it.
Will keep this in mind and start hitting up the art section. Screw Kiton, I want a Rembrandt.