Click on an element. You can then click and/or hold the mouse to add some in the black room. WARNING: Do not put too many dots-- extreme lag with more than about...okay, I don't actually know the max before lag...
I used cloning to do this. GO 2.0!!!!! I also used the custom block feature in Scratch 2.0. GO 2.0 AGAIN!!!!! Tell me what you think! Update 12/4/13: Better pixel graphics! And... no more updates. Development paused permanently.