Personally, I'll wear a frilly pink and white collar, and a tie with dancing sugar plum fairies on it if the money's right :)

I think that everyone else has covered the basics, but if I had to make distinctions, I would say I'm a "blue collar" employee if I'm getting paid by the hour and make overtime. If I'm working under contract for a total job (I get paid the same amount whether it takes me 2 hours or 20 to finish), then I would consider myself a "white collar" employee.

Presently I'm getting paid by the hour, so....