The bad thing about knitting a colourwork project is that you always have a bunch of half balls left over. Conversely the good thing about knitting a colourwork project is that you always have a bunch of half balls left over. I find myself in this position now after completing the Sheep Yoke baby cardigan. There are two strategies for dealing with this situation.
1) Buy a little bit more of the main colour and knit a second one of whatever it was.
2) Knit another project which uses a bit more of the contrast colours and a bit less of the main colour.
Having tried option 1 before, this time I went with option number 2 - introducing the stripey yoked baby cardigan.
I really like the pink, blue, brown, and green stripes together - in fact a few colours more and I'd have a tube line cardigan.