A few artists are joining this activity who was started by Gina Perry. Basically, the premise is that it takes 21 days to form a new habit. You choose an area or theme to challenge yourself and spend about 15 min a day ....you will develop a new habit in 21 days. I don't think you have to be an illustrator to join in either, you could do any type of art. I think the idea is to step out of your comfort zone, which sometimes is good to do.
I will eventually join in, but I want to finish my web site first. For anyone reading this, visit Gina Perry's blog or Alicia Padron's blog and take a look at what they are doing...maybe you'll get inspired and join the excercise.