Low water, uneven dyeing, and making it work! 
Take a skein of yarn that has a color you’re not crazy about. Do the vinegar and water thing. Put it in a crock pot and cook it with Wiltons Food Coloring. But, don’t take my word for it, go to the Christ, Coffee and Knitting Needles Blog for the instructions:
Not too long ago I did a test knit for another designer that was for a cabled cardigan. It’s really cozy and nice but it just about broke me in a ton of different ways. I couldn’t get gauge, which I suppose is my own problem, but mainly I was somehow both bored and forced to pay attention at the same time.
Thanks! Feel free to link to ANY of my tutorials!