Tutorial: Favor Bag Backdrop

I had the hardest time coming up with a backdrop for the cake table at Camden's Angry Birds birthday party. My idea of using Post-It Notes to create a pixelated backdrop sounded brilliant, but it turned out to be a flop (which was why I had so many Post-It Notes for the neon heart backdrop). Finally, I came up with this 3-D backdrop using the polka dotted bags that were used to hold the party favors. As promised, here's the super simple tutorial to recreate this favor bag backdrop : )