The fine folks over at Hack A Day posted a how-to on making your own RGB combination door lock. Not for the tech faint of heart, this lock is based on a chopped down version of the Arduino Monome clone.
The step by step process comes complete with schematics, shopping list, and pictures. We here at Daylight Curfew would like to request one put on every possible door, cabinet, refrigerator, and trashcan we own. Sure to please probably every geek on the planet and even the unborn ones too. Have at it here.