I think the last game I bought for my 386 was Nomad. ISTR having to make space since it required like 9Mb of the 40Mb drive.
30-polygon-per-ship level 3-D space RPG with limited combat sequences. I think I played it wrong because I seemed to walk largely linearly through the story and defeat the Big Bad without seeing more than 1/10 of the galaxy
I tried custom laser engraving caps, some of my favourites:
‘Attack 0’ and ‘Attack 1’, actual key legends on some '80s Casio home computer
‘Run Stop’ from Commodre machines
The “diagonal half full box” inverse video key from Atari XL/XE keyboards.
I suspect the various Jolly Roger designs from either fictional or real pirates would work well. Or various “spell type” or “faction” logos from games.