I'm knitting two pairs of socks using the same pattern (Cabin Socks from The Knitter's Book of Wool) but different weights of yarn, and I'm alternating back and forth between them so that half of each pair is now complete and both second socks are under way.
You can find the thick version here - it's in DK alpaca - while above is the finer one, Yarn Yard Clan, 100% merino, in a colour which the camera would not capture accurately but which is a warmer, greener green than the pictures seem to show.
The pattern is written for DK yarn, so for the finer pair I cast on 60 stitches instead of the 48 specified. N.B. conversion is straightforward except for one point: in row one of the heel flap I knit 15 stitches of the 60 (rather than 12 of the 48), leaving the remainder for the instep. That's the correct number, but as 15 is an odd number, it means that when you return to the instep stitches for the gussets you must begin the broken rib pattern 'purl one, knit one ...', not 'knit one, purl one...' as you would had you worked the 12 stitch, even-numbered version. I didn't discover my mistake until I was far past it, and then with heart in mouth I had to drop each of the 30 instep stitches in turn down several rows and, using a crochet hook, pull them up and set them right. It was fiddly.
Whether you're using thick yarn or thin, this is a very good pattern, and one I'll return to.