I used white crafting paper that is sold by the roll at Hobby Lobby. We painted the background blue, added some green for grass, and then let it dry. While it was drying, we cut squares out of sticky back foam to eventually become the kites. We wrote the names of all of David's classmates on a "kite". When the poster was dry, we stuck the kites to the paper. While we attached the kite, I placed a piece of ribbon under the kite so that would stick to the poster as well. Then we added some stickers and a message to the poster.