Pixel art: there's a
whole thread about them.
OP has a fairly complete spreadsheet at the bottom.
I used some of those already there as a starting point:
WASD V2 TKL: modded to ISO and changed the colors of another to match my set.
Dell QuietKey: started off from eyesnine's AT101, modded to ISO, added the QuietKey text, tweaked the case a little.
ThinkPad Compact: began using sealcouch's M13, required the most work I'd say.
Microsoft Sculpt Ergo: found a render from MS, modded to ISO, made the background properly transparent, shrunk it.