Twisted Fiber Arts makes really interesting self-striping yarns that shade in long transitions and have intermediate colors that make the stripes seem to glow. Here are my socks in their Ravelry colorway.
I used a gusset heel pattern… just stubborn. If I were going to use this yarn, again, I would do an afterthought heel in coordinating color. TFA offers mini-skeins in coordinating solids.
I didn’t manipulate the colors to come out in stripe pattern after the heel. Perhaps I should have broken the yarn after the heel and re-started in stripe to match with the instep. Oh, well! In shoes, no one will notice...