Oooo, nice! What a creative way to stretch your ... um, creativity. :P I must try this! But with my left hand!
It's a common exercise in gesture drawing. Lets you draw uninhibited by stored symbols that you, if you'll excuse the pun, draw on when drawing with your preferred hand.It's also fun to draw with a long stick with charcoal/marker/brush attached to the end. It makes you really fish for control. Have fun!
Very nice set of figure drawings!!!!