4-Fletch - - all Hot Pink - - at least I voted for pink. White nocks help some, but for me, the pink stands out better in the field regardless of foliage, snow, or light.
Even picked up some wraps that fade from hot pink to white and back to hot pink for additional visibility. Plus, the fade to white on the wraps helps with blood identification on pass-throughs.
Reading some of the other comments though, I have to agree that sometimes, blue will jump out pretty well - assuming there is sufficient ambient light, and provided it isn't buried under grass and such.
Shooting the local trad league, several guys have commented about how that pink fletching stands out like nothing else. Thank goodness I'm secure enough in my manhood to just smile at the few snide comments that get made. My typical reply is that I've never lost an arrow in the field.