The real-time collaboration of this looks cool. I don't understand what the dinosaur (or now penis) has to do with it. I can't make those colors... where did those come from? I made something called Sketch-a-bit (for Android) [ http://sketchabit.adamsmith.as/ ] that's a charcoal-like sketching interface that has you start from someone else's drawing instead of a blank canvas. It's been alive for about 3 years and it'…
It's possible to set any color by doing something like: firebaseCanvasData.child(row+':'+col).set(color)