I started making my son a felt jack-o-lantern (more on that later) and thought having a felt board might be fun too. I always had one in my preschool classroom and the kids really enjoyed playing with it.
So I had this box from my new printer made of nice thick cardboard. It had two styrofoam inserts which I left in for durability.
I stretched black felt over one side and stapled around the edges with my staple gun (like I said, nice thick cardboard). Glue might work better if you're using a normal cardboard box.
For now I just left the edges of the felt untrimmed, but I figure at some point I'll do something to make it look more polished. I'm also considering options for the other side - chalkboard, magnetic board, dry erase - there are so many options!
Oh, and as for my rainbow of felt pumpkins...I just traced around a pumpkin shaped cookie cutter and cut them from leftover remnants from past projects. I may end up playing with this more than Abe does!