Personally, I wrote nasty DOS user interface shells in QBASIC for my step-grandfather (who was completely inept but expected to use the glorious 386 computer to write news articles), and snuck off to play shareware CD volumes and Carmen Sandiego games. One of my favorites was a game where you tried to dive down into the ocean and evade sharks and stuff. It was really whacky. XD
I didn't get a 486 for a few years, it was a Compaq 486/66 DX2 (no FPU of course) and I mostly played evil little boring games and got gaming hints off of school Macintoshes (it was -amazing- after all when Netscape 2.0 was finally released).