Depends on what I am writing and for what, I prefer black pens for most things but for letter writing I love using colorful pens and doing like patterns and stuff. My favorite are really thin felt tips.
Well, it really depends on what I'm using the pens for, but I usually use black or blue since that's what's required at my school. I'd rather use any color that I have in a gel pen (or any pen that's good for writing), though.
blue or black, whatever i've got that's either of those two. i've got red pens too, but i hardly ever use them except for writing in the margin on paper with black text.
I only like black if I'm just writing. My step sister brought me back some awesome Thai pens from her holiday, but they're all blue, so I'm reluctant to use them...;-;