Minecraft Bulletin Board

Reading Owls Bulletin Board

Fairies Bulletin Board

Ocean Bulletin Board

And this is how it all went down:
Buy The GREAT STUFF and some acrylic paint.

Spray a mound for the octopus' head.
Bumps are good.  I added some "freckles" with a puffy paint for texture.

Spray some "legs" and coral reef-like arms:

Then paint the octopus and the reef any way you like:

 Attach the pieces to fit using anything you can.  It's all pretty light so this part is not difficult and neither is attaching the foam pieces to the wall board.  I simply used hot glue and long skewers (ones that I use for BBQ).  VIOLA!