We finished several sets of these using the tutorial I posted previously. We used the glass marbles/stones from a local dollar store that were marked jumbo. We used Elmer's rubber cement to attach the photos and it worked perfectly. We also printed our photo sheets at home using HP paper and did not have any trouble with the ink running. I decided to use prints from popular Michael Miller and Amy Butler fabrics, but you could use any images. My kids even made some from the Sunday newspaper with the leftover marbles/glass stones.
We found that six of these larger magnets fit perfectly in the metal gift card holders sold at stores like Hobby Lobby and Michael's. The best part about using these is that the outside is already decorated and they have many designs to choose from. The magnets stick to the tin so they don't slide around. You could add a colorful piece of tissue paper to finish it off. I plan on making a few more of these. I am going to do a set of Twilight magnets for my niece for her locker at school.
These are some of the images I used. Feel free to click on them and then you should be able to print onto photo paper for your own use. I scaled it to a 4x6 and then printed several on one sheet of photo paper. Just trim and attach.