Interesting work.

I know that this isn't exactly what you were asking for, but when the work is interesting, it's amazing how little else you notice. And when the work is boring, nothing else seems to help.

OK, OK, let me add a few perks I care about:

  - windows
  - good light
  - fresh air, proper venilation / heat / ac
  - enough personal space
  - peace and quiet
  - decent break area
  - decent snacks/coffee available
  - donuts Friday morning
  - beer after work Friday
  - flex time
  - nice dinner once/month or quarter
  - foosball (conflicts with peace and quiet, but...)

Most of all, you do these things because you really care (I believe you do) and not because you're supposed to. Any worker can smell a phoney giving cheap perks a mile away.