From Interweave: "I am the boss of my yarn! I can blend colors! I can change from one fiber to another in the same skein of yarn! I can spin gradient yarn from any old fibers! But sometimes being the boss is too much work. Sometimes you want the fiber to do the work for you. You want to spin gradient-dyed fiber.
There are more ways than you might think to spin gradient yarn that preserve the color progression."
Interweave shares the four easiest ways to spring gradient yarn in this post