FotoSketcher is a 100% free program which can help you convert your digital photos into art, automatically. If you want to turn a portrait, the photograph of your house or a beautiful landscape into a painting, a sketch or a drawing then look no further, FotoSketcher will do the job in just a few seconds.
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GIMP is a versatile graphics manipulation package. This page should help you get a taste of what GIMP is capable of.
Main Features:

Customizable Interface:
Each task requires a different environment and GIMP allows you to customize the view and behavior the way you like it. Starting from the widget theme, allowing you to change colors, widget spacings [...]