A simple project with one part that has a die that you can put on a ship a roll it where ever you want. You can release it using a separator so that it can roll free on the ground. You can just let it go, or push it using the exhaust of an engine.
This was my first mod to understand how to make one. It took me just a couple of hours and presented it self as a easier task than expected. My advice to all of you that are playing KSP and want to give back to the community, just try! It is fun and easy.