I found a way to get a lighter hair color for markers. I colored a mixture of brown/yellow/red and scraped away some of the marker with a colored pencil (yellow the time I tried it). I ended up with a nice reddish/brown colored hair (though I should have been more careful....I scraped way a hole in my characters head. *eep!)
Yes, I find using markers and pens fun. Only problem is when I can't erase!