When normals maps were not used, where per-pixel lighting was unheard of, when ragdolls weren't used and PS2s not around, those were the days. Some days I wonder what it would be like to make a simple computer game in the fashion of the old with extremely low-poly models, nothing more than diffuse maps, and textures small in size.
To make it really pop though, how about a game using the graphics of yesterdecade, but the animation, sound, and gameplay sophistication of today? Imagine a game old in graphics but powerful in spirit. A game that can run seamlessly on aged hardware. A game that feels like a jewel lost in the past.