Casting on with two colors separately
Recently I wanted to knit something using two colors of yarn from the cast-on row, but I didn't want to "wrap" the yarns. That is, I wanted to cast on 1 "stitch" of color A and then one stitch of color B.
So I did. I cast on 1 st of A, then 1 st of B, then 1 of A, then 1 of B and kept repeating that A/B/A/B cast-oning. (Might one call the Abba Cast-on?)
Then I PURLED the first row using ONLY color A. Then, turning, I purled right back in A on row 2.
Then for row 3, I purled using only B -- and purled back in B for row 4.
Keep working back and forth this way. What you get is a two-sided piece, one side of which is solid color A in reverse Stst, the other a solid color B in reverse Stst. Fanfriggintastic! said I.
You also get a two-sided piece in the general configuration of a pillow case or pillow cover: 3 of its 4 sides are "connected;" the 4th is "open" at least until you've completed the knitting and sew it together.
On the off chance that this was not discovered by several score others generations ago, is there a Nobel For Knitting?
Try it. It'll drive you crazier faster.