Sometimes you would like to blend two colors into one, dynamically; for example as ViewPager gets scrolled, you want one color to dynamically change to the other color smoothly.
In this case, ColorUtils would be helpful.
In this talk I talked about how I used ColorUtis to achieve the desired UI by giving example of the implementation detail for Torte application.
ColorUtils | Android Developers
shaunkawano/android-color-blending-sample: Sample Android application demonstrating how color blending can be achieved on Android