Depends on my mood. And it certainly isn't limited to blue or black or pencil. Sometimes it's some other more exotic color. I really like brown ink for some reason, and red also is a favorite.
When I was in school and got tired of people missing classes and then asking if they coud xerox my notes, I started doing my notes in various light colors that do not reproduce well on copiers. Once in awhile didn't bother me, but there were occasionally people who never came to class and always just expected me to hand over my notes. It got to be a variation of "do you own homework".
Whether I handwrite or print, and exactly how I handwrite (backhand, straight up and down, or slanting to the right) when I do, also depends very much on my mood. I've sort of thought about whether this means something about multiple personalities or is just an eccentricity.

:smilie: