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How did I do it? Easy - Neon food coloring from the grocery store. Just squeeze a few drops on a sponge (I used a new dish washing sponge) and apply to the desired hair. Since all I was coloring was a small area I just applied it to dry hair, but they say if you want to dye more then you should dilute the food coloring with water and wet your dog.
I let the color sit for about 15 min, then took an old wash cloth and rinsed off the excess. If you get any on your fingers, Dawn dish soap will take it right off.
Enjoy the coloring possibilities!