Here's an idea, I figure most of us love those cluttered, full of junk and type graphics we see so much of ... anyone can enter this one, the idea to keep it very simple:

900 x 420 (no rotation)
no graphics - just text and shapes
you can only add one item per volley so by keeping it very simple, there will be lots of entries from lots of different people and quick turnarounds since you're only adding simple components.

Like it? Go nuts