2. Dimensional Magic (Mod Podge)
3. Magnets (Round)
4. Marble Accents (make sure they are flat on one side)
5. Art Work
6. (Not Pictured) Hot Glue Gun
Measure the size of your marble accents to get a rough idea of how big you need to make you art pieces. Use a computer to crop your selected images into circles of the right size and print them. I used card stock which is better for durability. You can use your own photographs or you can search this great site I found several months ago. They have tons of free vintage artwork for download.
Cut your pieces out. A tip for cutting circles neatly: cut further back on the scissors. This give you more control of your pivot action and keeps the cut nice and rounded.