K, yes. Every month is a new challenge.

All forums / software / or talents are allowed to enter. The winner(s) of the prior month get to select the theme for the next challenge. Based  on the theme, you can submit almost anything... be it a snapshot of an Oil painting you've done for the challenge, a photograph, pottery, 3D rendering (any software) or a 2D drawing.

Kind of a melting pot of challenges. :-) 

Those are the 'official' challenges. You can also sumit your own challenge to the forum as well.

The doctor says I have way too much blood in my caffeine system.