These are fun enclosures for your iPod or other smartphone. I made a simple one for my G1, and now need to find some driving/biking games to try it out on. It was fun and frustrating to stir the bin in search of just the right part. So often, when kids build with them, they make wildly complex designs that are at times of low structural integrity. Is there any formal LEGO design curriculum out there?

This is a great way to test out your rapid prototyping skills. Once you get a decent iteration, then the hunt is on for a more permanent solution.