Turn your android device into a wireless drawing tablet.
It won't replace a real graphics tablet because it doesn't register any pressure levels, but it makes it easier for you to draw on your computer.
The server software can be downloaded here http://tinyurl.com/nr8yanz . Install java (http://java.com/download/index.jsp) and doubleclick the WifiTabletServer.jar file, then start drawing.
If it does not connect, your firewall could be blocking java. Follow this video tutorial to allow java through the firewall https://www.youtube.com/watch?v=XZOxgiCuOU4 .