One of my all-time favorite sock yarns is Online Supersocke, fortified with aloe and jojoba so that it's extremely soft to knit and wear. It's self-fair-isling, and looks fabulous and difficult and impressive (wink, wink).
But here's the real magic--the yarn is as great in miniature as in adult socks. Aren't these booties adorable? Fabricated entirely from leftovers, of course.