I came across some exercises I did ages ago from a book by Lucia Capacchione "The Power of your Other Hand" which are designed to unleash creativity. The vase of roses, I think, is better using my left hand (I'm right-handed).
These are fun!!! I can't even draw with my right hand much less the left oh dear!!!! hehehe!! and love the new ATC's too look great!! has been a slow week on ebay!! hope better soon!!!!