it's very easy (Score 1)

do it in a epld, cpld, pld. would take me a few mins to make one using that. just use some pull up resistors and so on. could hook it to a computer if you want to change the color, or could just use a DIP, and depending on the value it will be a certin color, or can make it cycle through diffrent colors, depending on what you want. could PWM it as well, for brightness. oh well, want more info, msg me.