Dying Yarn with Kool-Aid: http://knitting.about.com/od/yarn/ss/dye-yarn-kool-aid.htm. You can even do it with a child.! http://www.makeithandmade.com/2013/03/Yarn-Dyeing-With-A-Toddler.html
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This is the third part of a "series" on dying for crochet but I think it works for any yarn-based needlecraft. http://crochet.craftgossip.com/dye-ing-to-crochet-part-three/2013/09/14/. You can find lots of links in this write-up. The links for parts one and two as well, which were more introductory than instructive are: http://crochet.craftgossip.com/dye-ing-to-crochet-part-one/2013/09/10/ and http://crochet.craftgossip.com/dye-ing-to-crochet-part-two/2013/09/12/