This guy built a fully functional Guitar Hero controller out of Legos. He says:
This is a custom guitar controller for the game Guitar Hero, modeled after a Gibson Explorer guitar, with an extra large scratch-plate for style. I gutted the real controller and put the electronic boards in the lego case, so it actually works, too
So does making something out of Legos automatically make it cool? Because I replaced my friend's medicine with Legos once and he just ended up in the hospital. Which I thought was cool, but he seemed pretty upset.