I'm not voting coz I just use whatever colour i got:
Red, Orange, Yellow, Light Green, Dark Green, Light Blue, Dark Blue, Purple, Black, Pink, White, Flourescent yellow, Flourescent Orange, Flourescent Red, Transparent, Silver (metal)...
Oh yeah - and I USE CLIPPERS/PILOTS/PROFS/RONSONS NOT BICS! (Dunno what the obsession is with bics...at least clippers, pilots and profs are refillable...
- ah well, the americans will learn one day!)