This is fairly old news now but MIT have developed a US$100 laptop that runs Linux for distribution to schools in the developing world via government programs. MIT has a website for the laptop (which is not yet in production), but the pictures that are available show it in a rather shocking luminous green colour!
The specs are (according to the FAQ):
The proposed $100 machine will be a Linux-based, full-color, full-screen laptop that will use innovative power (including wind-up) and will be able to do most everything except store huge amounts of data. This rugged laptop will be WiFi-enabled and have USB ports galore. Its current specifications are: 500MHz, 1GB, 1 Megapixel.
There is no “Why that colour ?” question in the FAQ unfortunately..