one day late for halloween on the public internet (a primitive, antisocial environment where you can't login, talk to your "friends," or gain access to the onboard tools to not "like" this).
experiment with using the Windows 7 MSPaint program as intended. the brush blending isn't fluid at all, so you have to force shades to merge through vigorous scrubbing movements to get anything remotely painterly. not a very enjoyable process but if frustration could be visualized it might look something like the above.