I've been dying to try this, but I'm not sure how well it would work with really dark hair. Seems like the thing to do if you're not sure you want to completely commit to a color, or if you wake up one day thinking, "I want outrageously pink streaks in my hair today," you can do that instead of reaching for the bleach.
Have you tried finger waves? My hair's about the same length as yours and I love doing that. It's not too hard either and looks super cute with a flower in your hair or other adornment.