Hair Glaze Question

I'm going to get a trim on Saturday, and I'm toying with the idea of doing a colored glaze as well. I've only done clear in the past. My hair is very dark brown, and I don't want to dye it or get highlights and mess with my natural hair too much, but on the other hand I'm getting a little bored.

My hair gets kinda coppery highlights in the sun anyways, so I was wondering if a coppery brown glaze would do anything to my hair at all. I kinda liked how Kristen Stewart's hair was in New Moon, still obviously a brunette but little hints of a coppery red.

Any hair dressers or hair color savvy girls know if this would take on my dark hair, or if it would be a giant waste of money?