I just placed an order at www.calendars.com for our upcoming artist study. Since I was buying 2011 calendars (one was even in Spanish), I was able to get wall calendars from 95 cents to $6.95 each. The often 12x12 size is perfect for picture study as well.
Be careful that you select wall calendars and not the smaller mini size (unless you want the smaller size).
For each artist we study, I adorn the kitchen walls and refrigerator with his or her art work. Since we are studying Impressionist artists, I selected several Impressionism with a variety of artists and some Monet, Renoir, Degas, and Cassatt. Here are some examples:
Great Impressionists 2011
This large one is 19 x 18 inches!
This Mary Cassatt one is only $2.95.
Here is a Monet one for only 95 cents!
Use the code "ACCESS" to get 10 percent off; shipping is also free if your order is at least $25.