I think it depends. I had a friend at school who would not even come to the common room without make-up and perfume on if there was the slightest chance the boys might be there (the same boys who had seen her every day for the last 5 years and if they were going to be impressed, would have been by then. She would spend hours getting ready, doing her nails etc. I think that is quite vain.
On the other hand, there are lots of people like me, who don't usually wear make up or anything because I don't feel the need on a day to day basis. However, if I'm going out or something then I will, because it's nice to know you look nice and to feel good about yourself. I don't think that's particularly vain really; I mean it's not exactly necessary, but it's nice on occasion.
Riffraff - I have my hair highlighted and I like it a lot more than when it was plain brown. I don't go for the fake tan thing though, because I'm so pale it would just look wrong.