I did view the second last episode of Al McDonald's run from September 1986 that I downloaded a while ago, and I did discover the background colors of two Fame Game cash prizes. $700 was a dark pink, and $100 was a bluish color.
These Fame Game cash amounts looked to have switched to a neon/pastel color scheme by that point, and it seems as if, by the mid-80s, some game show props were being changed to a neon and/or pastel color scheme (Press Your Luck went neon in August 1985, and NBC Wheel of Fortune changed the wedges to a neon and pastel color scheme sometime around the summer of 1986).