Applications for LEGO NXT robot

Hello, We want to get applications (software) for LEGO NXT/Mindstorm. Applications should be cool, innovative, fun and something that make you want to use it again. Application should include: 1. code file to run on the controller 2. instructions how to build the robot 3. list of sensors participating 4. list of any external components (if any) 5. link to a video demonstrating the robot running. We will accept many applications, so feel free to submit the concept description and a link to a video showing the robot doing what described. We will pay 50$ per application. Note - applications must be royalty free!