Color Thief is an interesting app for photo buffs that copies color information from one photo and applies it to another. That makes it a rather unique feature. My first reaction was "who cares?" but after playing with the app for awhile I found it interesting to apply a color scheme from one landscape photo to another. The results were sometimes weird, but at other times I liked the result, and it was a color scheme that I could not have arrived at any other way.
I also took one color selection from a single image, and applied it to several other images, so they all had similar color tones. Great for creating a collage. Images are saved at original resolution which is a plus because so many apps scale them down.
Finished image