Oh! Toes!
website of different toe-types for socks
I was pointed to this site by The Alternative Complimentary Knitting Log

Couple that with the Heels and Toes info from the Socknitters page, and you have a goodly number of variations.

(I'm still looking for where David Mackay's excellent "heels by number" page is supposedly archived on the Socknitters page - haven't found it yet. Sigh.)