We bought a large wardrobe cardboard box at Ace.  Red and white polka dot wrapping paper at hobby lobby.  I cut down the edge of one side of the box, so we could open it up.  I laid the box on the floor and opened up flat.  Used clear box tape to wrap the board with the paper.  We had to use two layers stacked to cover the entire board.  Then stood it up and added the balloons and the carnival sign. (Carnival sign could be changed to holidays, wedding, etc...)