Not sure how much help this will be. I recently made a scarf for my soon-to-be-16 niece from off-white cotton. Boring color. (Plus I was planning to weave a novelty yarn for interest.) Brewed up sage into a thick tea, then steeped the scarf in it, at simmer, for 30+ mins. Would've loved if it had remained the rich brown of the tea but after all the cool rinses, it was a soft dusty loden. Interesting, subtle. No clue how the color will hold up but given it's a scarf, and with the novelty yarn, I sugg my niece only rinse in cool water, with mild detergent, if necessary.
As point of ref, the color reminded me of those in the Lion Organic line.