Highlight your blond or brunette hair at home using coffee.
Brew some real coffee (not instant), let it cool down until it is warm, then apply all over your head or just to a few strands. Leave on for a few minutes, and when you rinse it out (don't shampoo yet!), you will have great color dimensions. This will last a few days to a couple weeks, depending on how light and porous your hair is.