This competition is all about vignettes. There are quite a few categories that you may enter, check them all out by looking at the discussion topics.
For new and existing members, make sure you check the rules and make sure you are following them. The judges would hate to disqualify anybody because they didn't follow the rules. Another contest more focused on one size of vignettes can be found in this link.
Caleb's 4x4 contest.