I have the heel on the second of the two Opal socks nearly done. These are made from one of the Opal 2002 colors, the grass green with stripes of primary blue, red, and yellow. (It's #521, you can see it here. I bought it from Carodan Farm, one of my new favorite yarn sources) They are coming out almost identical - I was lucky in that I was almost at the same point of the yarn at the end of the first sock as I had been at the beginning. I did an eye-of-partridge stitch heel with the garter stitch edging, turned a French heel, and I did a round to (following the Welsh Socks instructions in Folk Socks - I used 72 sts for the Opal socks, so the pattern was exactly right for it).