Linky-poo: Moonlight slipper sock free pattern from "Knitting Pure and Simple". (There's also links you can click for a hat and mitten pattern on the same page. I actually like the simple fair isle hat pattern better than the socks.

(I have to admit, a pair of moon-and-stars themed socks I like even better, and plan to do SOON, is available here (N.B.: PDF file, needs Acrobat Reader). )