I found this while Googling around the other day, and thought it might be fun to try:
[link]If nothing else, it should make me more productive!
Day 1: Self portrait

Day 2: Draw a figure using a reference

Day 3: Draw a figure that's in action, using a reference:

Day 4: Draw a part of the human anatomy you have trouble with. x20, with at least 5 being skeletal/musculature studies.

Day 5: Draw more figures. Quick gestures and silhouettes. x20, with atleast 10 different body shapes.

Day 6: Use character generator. I got: adult female, street clothes, bow and arrow. I interpreted "street clothes" somewhat loosely.

Day 7: Pick the weirdest object in your house... not that weird, but it will have to do:

Day 8: Find 2-3 objects, make a scene with them.

Day 9: Draw a landscape of a place you've never been or drawn.

(Got sidetracked by another project, but now I'm back at work on this)
Day 10: Draw a BG with 1pt Perspective. Negative points if it's a railroad or an empty street.

Day 11: Draw a BG with 2pt Perspective.

Day 12: Look out a window. Draw what you see. Bonus points for adding something interesting.