The toxicity of walnut aside (which should be something you look into), yes you can do it.
You can get some over at henna for hair, and I've run a few strand test on mohiar (plain white goat's hair). I got the best color results when it was simmered with amla for awhile and then left to soak on the mohair.
In the tests above the walnut was just walnut and warm water made into a paste, the walnut amla mix was the same (and I can't find the damn ratio anywhere yet).
The two simmered samples were mixed with water and simmered, with distilled water added to keep it from burning. After an hour or so I let it evaporate down to a more concentrated thick sludge and then applied it to the mohair.
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