I also tried out the SketchFu tool and I think it is very fun and creative! I would use this tool a lot, just because I have a lot of fun doing it. When you start a new page all you do is draw whatever you want and you can replay the slide and see the exact way you drew it. You will need to set up an account but I really think everyone should GIVE IT A TRY!:)

This is what I drew!