Monster Mash: Zombie horror survival, only without pansy guns. Can you and two BioDevs manage not to die for 10 minutes?
This is the challenge module from the second Dragon Age Builder's event, created by Tenjac, Ranlas and me in about 5 hours - including the "design" and "planning" stages

. Yes it's a little rough around the edges (cutscenes? we don't need no stinkin' cutscenes), but it does show it is possible to make something playable with the toolset in only a few hours.
There's no screenshots on the project yet, but there is one in the
Gamespy article about the builder's event on page 3.