This site is called Garden of Praise and it has a section that offers art appreciation lessons for kids on famous paintings and learn about the artists as well. This site offers biographies, worksheets, prints, puzzles, printables as well as links for further research on a particular artist and links to art lessons. The prints on this site are public domain. Not bad for Smartboard use.
This site has a game called "Who is the Artist"?
http://gardenofpraise.com/art.htm