We picked up some hardboard from Lowes and had it cut to her desired size (totally up to you). We then hit the swimming aisle of Target and got 20 thick pool noodles. They carry two sizes and she preferred the larger ones. Lastly, a quick stop at Hobby Lobby for this yummy black velvet fabric (add 2-3 inches to your board size to determine fabric dimensions). The rest of the supplies I had at home.
3M adhesive spray
Sharp knife or box cutter
Scrap 1x2 or straight edge to draw a straight line.