From Apple’s “The Power To Be Your Best” ad campaign that began in the 1980s, and uploaded to YouTube by VectronicsAppleWorld, this was probably the best ad I’ve ever seen for the Apple IIGS. It not only focused on the color capabilities of the IIGS, but also alluded to its advanced graphic and sound compared to other computers of the day (including Apple’s own Macintosh, which at the time was still primarily limited to a monochrome display).
http://www.youtube.com/watch?v=6gtjbi3-oE8