You don't really need a pattern as such. But it depends on what size needles and yarn you're using as to what the outcome will be
I would cast on enought stitches for however wide you want it (around 4/5 inches is good). knit however many rows you want for the first stripe. Join the 2nd colour, but don't cut the 1st yarn! Again, knit untill the 2nd is how wide you want it, then swap back to the other colour. Carry the 1st colour up the side of your knitting as you go, twisting it with the first stitch.