I decided to henna my hair, so I've got my head wrapped in plastic wrap, trying not to drip on the camera. I haven't tried this for years, and now I know why. It's messy, and you have to walk around with saran wrap on your head for at least an hour. On the flip side, it's all natural and conditions the hair as well as adds color. This particular henna covers gray. I didn't purchase the indigo which may be mixed with henna for brown. I am hoping for auburn, not a carrot red.
I'm wearing my husband's old t-shirt, and an old towel around my neck to catch drips which happens every time I look down. If I had some cotton strands, I'd stick that under the edges of the wrap. Plastic gloves are a must, and a little Vaseline on the skin around the hairline and ears keep the henna from dyeing your skin.
"After" pictures later....
It turned out great, and my hair is back to normal, dark auburn and curly. I had been getting a light golden color at the ends(?) with dark roots, peppered with gray. This is so much better than the gray, two toned stringy look that I had developed. Completely worth the hassle.
This store sells bundles for different hair colors and types - long and African hair. You just have to scroll all the way down to the Hair Care Directory at the bottom. There is also a free ebook at this link for first timers.