Would you like another Game Jam? The Skills Matter eXchange is happy to oblige, and they are hosting a free one day game jam on the 10th of August, with food provided!
Important! Sign up here: http://skillsmatter.com/event/java-jee/london-gamecraft
Game Jams are an excellent opportunity to quickly prototype silly ideas and collaborate with others for just a day. Be warned though, 12 hours is really short! Excellent practice to focus on the most essential parts of a game.
More info on their site (see above).