ArtTrader Magazine  Issue 9 contained a great article (page 53) on making 10 minute intuitive faces. I heard about this via a ATC swap hosted on the site ATC for All. I found them to be a great way to just relax and play with watercolors.  

ATC024 I tend to be a little stiff and it usually takes me a while to loosen up enough to paint without overworking the watercolors.