Here's some pics from the early days of Saturn (1983-85)
The sedan is pretty familiar, the coupe is variation on other versions I've seen, but I never knew about the minivan before. I guess it would have been a cross between a Colt Vista and the GM APV.
I picked up some interesting trivia on the Saturn design development from Car Styling bi-monthly.
First, the sedan design you see here was abandoned in 1985 (pay no mind to the fact they were using it as a test mule in 1988). Before they gave up on it, however, they did a more rounded version. That design was given to Isuzu and became the Stylus (can you see the resemblance?)
In 1985 the styling theme for the Saturn we know came into being. The original idea involved both the windshield and the backlight wrapping over into the sides. However, the windshield evolved into a more conventional design while the backlight held pretty much the same shape right into production.
The coupe theme actually came about from the original sedan, after they did the new theme in 1985 they adapted the earlier coupe design to the new design language.