ht to Beth! Thanks so much for the idea! You amaze me with your creativity!
Edited to add:
First I purchased the fun foam rolls from http://www.discountschoolsupplies.com/
However...now I kind of wish I had just used felt. (I am having a hard time with where to keep it when not in use!)
Anyway...then I printed off a 3*3 map from http://www.yourchildlearns.com/megamaps/print-world-maps.html
I roughly cut it out and taped the continents on the proper color felt. Cut it out more precisely and glued it down. I used Elmers glue-all and a Hot glue gun.
I would suggest trying something else! Maybe Tacky glue.
The hardest part is choosing what to cut out and what to pretend you are not seeing (KWIM). There are just so many islands!
It really was pretty easy. If anything is confusing just ask!