I saw the video Mark did about making a picture holder, which I've been needing for a long time. There was also a comment by someone, I think, mentioning magnetic paint. So I built the holder and then coated the front side of the board and the vertical post with magnetic paint. Man, that stuff works great! You have to use a lot of coats though, I think I put about 10 coats on to get it really strong. Now I just need to paint the rest of it with flat black paint.
I like how you can put one or more laminated photos up as you desire.
Here's a close up of the ultra strong magnets I bought at Home Depot for like $6.00.