The challenge offers a suggested theme for each month and the creative activity can be anything that you consider to be creative.
The theme for January is DARK which suits me fine as a lot of my art is rather dark.
To take a look at the challenge or to join go here http://creativeeveryday.com/2013-creative-every-day-challenge-participant-and-sign-up-page
I hope to be able to combine this challenge with the trash to treasure challenge, this should be an interesting combination.
Watch this space to see what I come up with...