Draw inside the box! Press the colors to change pen color, and reset to wipe the screen. You can add a message if you'd like. Press send when you've finished. Then, you can see the art you've made by pressing load!
There are still some bugs relating to color. I was intending to have this use the cloud (so you could see other people's art), but you can't easily make cloud lists and I'm not particularly interested in encoding lists into single variables.