Well, it's a pity that here on AtariAge people are not very familiar with Silly Venture party - probably the biggest Atari event in the world.
There's a lot of competitions there, for example these are the best 3 works from last year's Atari 8-bit graphic compo:
First place: Guardian (by Odyn1ec)
Second place: No Sheep Here (by Ooz)
Third place: Skullman (by Rocky)