Don't dye your hair. But for an interview, pull it back into a neat bun or pony tail. Remove any visible piercings and dress main stream. It's ok to be "alternative" but if you want a mainstream job, you have to look the part, unless you're in New York in Soho where the alternative look can be fine in some places. When is Rome, do as the Romans. Oh, and don't bring your hair color up on the interview. If they want to hire you, they will ask you to choose one color, not two. Remember to smile and be personable because they may not care about the other things if they really like you and can see you as a future employee. Good luck.