How to change my look over the summer?

Okay, so I want to totally change my look over the summer for the new school year (AKA re-invent myself) but I have some limitations. I have only about 100 dollars to spend on this so I cant go overboard. I cannot dye my hair because my mom won't let me (sucks D:) and I already have short hair and a new haircut. I don't like to wear a lot of makeup so I'm just thinking some mascara and eyeliner (plus all the skin stuff like foundation, etc.) I also don't really want to change my wardrobe so much. I already have these ideas, but you can elaborate on them or give me tips. Whiten teeth, change my makeup and wardrobe, lose weight, get a tan. Sorry for the complications. Thanks!! :D