I'm doing a scarf --maybe all in seed stitch (knit flat), I haven't quite decided yet. But it definitely will have horizontal stripes. Usually I do a chain edge (slipping the first stitch of each row) to avoid messy edges, but how would I do that when it's time to change colors? I've only really changed colors while knitting in the round, so am confused about doing it at the adge of flat work. Especially when I factor in the issue of the messy edges!