I've signed up for a few art challenges this year... first one is the 2011 Project 365. The challenge is to do some type of art every day for the year, the goal of creating an art habit. So far so good. :)
Sketchbook Challenge, where a theme is chosen for the month and you incorporate it into your journal/sketchbook. January's theme is "Highly Prized"...more to come on it as I get caught up from being away for a long weekend.