I'm a little late posting this, but as requested, here are the pictures and tutorial.
Stuff I used: E6000 glue (you can also use Mod Podge, but this stuff worked better for images I printed from my computer), clear, flat marbles, paper scraps and small disc magnets. You can get all this stuff at your local craft store.
1. Punch pictures with a hole punch or trace around the marble and cut.
2. Use a good-sized drop of E6000 in the center of the image. Press to flat side of marble. Squeeze to get out any bubbles.
3. Squeeze a drop of glue (E6000 or hot glue) on the back. Attach magnet. Let dry.
D O N E!
TIPS: try adding stuff to your magnets like sparkles, pressed flowers or ribbon. I tried all of those things and it worked beautifully.
my fridge:
(I don't care if it makes you gag. I think it's cute.)
with pressed flowers: