I give this website a 6/10. Overall, this website was very interesting. But, there was no undo button and it took a very long time.

http://thisissand.com/

I give this website a 7/10. It was very easy to create shapes and if you made a mistake, you could easily undo it. 

http://www.zefrank.com/flowers/

I give this website a 3/10. The website was very difficult to use. Unless, you are very artistically inclined, this may not be the website for you.

http://slimber.com/painter/