Knit ¾”of stockinette
Change to color B
k2 sl1 repeat to end
purl entire row
Change to color A
sl1 k2 repeat to end
purl entire row
Change to color B
k1sl1k1 repeat to end
purl entire row
Repeat rows 1-6 alternating colors A&B at every knit row until you get about ¾” short of the length you desire
Knit ¾” of stockinette (I plan on using color B on this end, but do what you like)