Android App - Easy Black and White
Easy Black And White is a fast and free app to convert any image into a two color black and white image. It features a convenient sliding scale threshold for conversion, and the ability to select your two colors (they don’t have to be black and white!). This is handy for creating artistic renderings, two-color icons, game art, and more!
You can see more on the permalink page here, or download it from the Android Market here.