I've entered into a new zone in knitting. When you run out of yarn while working on a project, just buy something else and finish it that way. I currently have a wavy scarf that is 2/3 lavender and 1/3 black. It will eventually be half and half. I've jokingly called it the bi-polar scarf, but I really think it has more of a multiple personality disorder.
I haven't decided if this looks interesting or if it just looks silly. The more I knit and look at it and think, the more I can't decide if it was a good idea to completely change yarns in the literal middle of a project. I'll post pictures as soon as it is finished for everyone else to let me know what they think.
Some other splits have good qualities: banana splits, for instance. Or ply-splitting projects.