"Get an allover semi-permanent color that's two shades lighter than what you are naturally," Van Gogh says. "Apply it over the botched highlights to tone." If your highlights are too brassy, choose a semipermanent tone with a violet or blue base (look for "cool" instead of "warm" on the box description). Of course, Van Gogh adds, some things are best left to the pros. "For major color changes or full-head highlights, go to a color specialist in a professional salon," she recommends.