From the wonderful mind of GIF artist Vince McKelvie: clickdragclick.com, a browser-based image generator that allows you to paint with selections of an image like a paintbrush.
-first select an image you would like to edit or enter a custom image url.
-click and hold to select part of the image, release and drag to paint, then click again to finish the stroke.
-the background parameter toggles the source image on and off and the sequence parameter animates your brush strokes.
-upload to save and share your painting
[All images Vince McKelvie/clickdragclick.com]