Double Art!

1. Select a target image; the image that will use different colors.
2. Select a palette image; the image with the colors to use (fewer colors = better results).
3. Wait a bit if you are coloring a large image...
4. Scroll down, right click, and save your new image!
5. Download! (right-click -> save link as...)
   
   
6. (Advanced) Select an comparison algorithm: RGB Average Light Level Hue Value
   Changing this will re-sort both images (computationally expensive)!