If nothing else, Pinterest is good for pilfering. Or as some moms, crafters, do-it-yourselfers, and artists say, inspiration. When I ran across the monster Valentine's box posted several times I had to try a version for my own sons. They love them and I can tell they will be proud to march them into class tomorrow morning for the annual trading of meaningless scraps of paper and old-tasting candy.
I pinned the ones from Last Minute Mel, but ended up using the tutorial from Giggles Galore. I didn't use the tutorial per se. But I printed it out so that 7-year-old could make his own box. He did a great job and really only required my help when it came to cutting the foam teeth and pushing pipe cleaner through the styrofoam balls.