Color tips and dip-dyed ends are still going strong. We did a DIY with oil pastels and chalk a little while ago but ideally, we think the Kevin Murphy Color Bugs that we gave away in October are the best solution. We picked up ours from Melange Salon but we know that Dandy Salon Spa, MUD, & Ponytails + Horseshoes all carry Kevin Murphy products so chances are they will have the Color Bugs.
Check out this video for a how-to on them in dark and light hair. Kevin goes a little heavy with the product but I guess he is trying to sell the stuff;)