Given the news that @croqueteer has released the source code to his landmark 1988 adventure/FPS hybrid The Colony (https://github.com/Croquetx/thecolony), I thought I'd dig out and repost the #macicons entry I wrote about it:

I still find myself drawn into the Colony icon every time I look at it. @croqueteer had a tough job with it — how do you translate the magic of the game's real-time wireframe 3D graphics into a static 32x32 pixel grid? — but I think it strikes a perfect balance between the clean/clear lines that every good icon needs (for legibility) and enticing imagery to attract your interest in playing the game. And like every good game icon, it's instantly recognisable to anyone who's played the game (and seen the cool ray-casting 3D as well as the creepy giant eyeball alien).

The Colony was infamous for the many ways in which it would kill you. Here's one involving one of two infinite corridors you could get trapped in (warning: loud sounds).