This is part of the Two Weeks of Code.
Neeon: A simple finger drawing HTML5 app, which ought to work on mobile devices too. Draws in bright neon lines. Almost certainly only works in Webkit, not because that’s required but because it’s unfinished. Children like the bright colours when drawing. I think this could be relatively easily tricked up into a nice app for Ubuntu Touch if someone were of a mind to do it.
On GitHub at: https://github.com/stuartlangridge/neeon.