How about a challenge to make a new loading screen? Multiple winners and winners get their loading screen added to Garry's mod.

An opening video. Not too long (about as long as the Valve sequence), it can show off a few features of Garry's Mod like the spawning, building (...gamemodes, if you must ), etc.

It would have to be longer seeing how there's so many things you could do I think a loading screen would be a good one.

But the time limit would make it harder to do stuff, thus we would get better entries. I thought of using little snippets of easy to identify stuff, like building and posing. You could use fly-by shots and those flash transitions. Kind of like the opening for Brawl.

do a serial killer challenge