You could use them as the centers of balls of yarn. Roll the yarn around it to make it easier to start rolling the yarn into a ball. Other than that, you could use them to store darning needles or stitch markers, safety pins or point protectors. Good luck!
I love to give homemade gifts... which one of my kids do you want?
Find our "Canadian Oddball Blanket KAL" on Ravelry as: OddballBlankets