A free program for Android, by itsmyapps.

The Hair Color Changer Real app is the pinnacle of hair coloring software for Android devices.

You just need to snap your own picture, give your hair a quick brush over, and then select from a variety of color options. When you are finished with your hair makeover, you will have the option to either send the results to your friends or save the image to your gallery. Give it a Shot Right Away!

Features:You can experiment with different hair colors on your own photo; you can draw and delete the hair region; there are 40+ Pre-defined hair colors (several hues of blonde, red, and brown), control over the intensity of the hair color, control over the smoothness of the hair, and control over the brightness of the hair color.