This was a small application I put together in Flash for a class I was teaching in the basics of digital imagery. The app is meant to demonstrate how GIF images work, meant to illustrate that you can have any specific color(s) you want, but only four at a time.
Users can click on a square to cycle through the four colors available, and can select a color to change its RGB components, allowing them to create old-school, lowfi images. To play with it for yourself, either click on the image or go here.