This is one of those great concepts that has a "this needs to happen" feeling, and it's a matter of who's going to do a great job with it. Looks like Ninja Blocks is on the right track.<p>However, as I think about the concept more, I'm having a difficult time finding a useful case for the concept. I think it's just because I'm not creative enough. So what would you, Hacker News reader, use Ninja Blocks for?