Does anyone remeber seeing something....thread?....iron on something?....that makes fabric shrink and crinkle?
If I didn't hallucinate that product, you could do a box of popcorn. Use some shades of white and maybe yellow and give it a nice textured look. The box would be easy to come up with.
Found it!!! Texture Magic!
http://www.youtube.com/watch?v=m1aOhov6I5U