Garry Newman, father of Garrysmod, started a gamemode contest.

The idea is that he wants to introduce Fretta (see "What is Fretta?" in my link above) with a few good gamemodes in the bundle. So the gamemode can be anything and the 5 best gamemodes get 1000$, they get to be shipped with Gmod and then you get to update them through Steam and add achievements to them.

I don't have a strong idea of what I could do yet, but I'm gonna compete.