It's now week 3 of the On The Other Foot Mystery Knit ALong run by Ann Kingstone & Sarah Alderson. I'm up to date (though only with the first sock) so I've finished the toe, foot and heel stages. Here's the sock so far.
I chose the option that has a cable and lace pattern on the instep, to go with the cable and lace pattern I had already knitted for the foot. (Though in theory you can choose either option at any stage. Some people made the other choice following a cable and lace foot, and it looks fine. So does the colourwork foot with a cable and lace instep.)
Part of the point of Ann and Sarah's MKALs is that you learn new techniques, and they provide tutorials to help. The heel with the option I chose is very neat, and completely unlike any heel I have knitted before (in my limited experience of knitting socks).
I'm really pleased with the result, and it was very straightforward to knit - just following the instructions. It uses German short rows, which I've never tried before - I've only done wrap-and-turn short rows before. There was an easy-to-follow tutorial with clear diagrams with the pattern, which I found quite sufficient, though I think that Ann or Sarah may have done a video tutorial as well.
Finally, here's a photo of the instep pattern, which doesn't show up well in the first photo because my ankle was bent. (Taking photos of your own foot in mid-air to show the detail of your socks is not easy.)
I'm looking forward to seeing what part 4 brings. I'm still undecided about introducing another colour, though on reflection it might have been nice to do the toe and heel in a contrast colour. But I couldn't tell until I had done it, and it wasn't clear at the outset whether you could do just the heel in a different colour with this option. Another time, another pair, maybe.