Katherine Cartwright has a great Twenty Minute Challenge blog now based on her own 20-minute challenge paintings she does while travelling. Take a look - if you really want to push yourself and your editing chops, try it! I think I might...and remember, you can paint small so maybe ATC size or 5 x 7 or similiar size would work...what could we create for this? Your own room, your office, yourself?
Check it out and have fun! And do catch up on Kathy's blog posts for the last few days - they will give you plenty to think about when it comes to your art and your direction!