Can one make custom modifications to Yahoo! Avatars?

Anyone know if there's a way to use photo editing or drawing software to make one's own customizations, not just trying on the different pre-fab elements that Yahoo! already provides? For whatever reason, while Yahoo! seems to have every possible piece of clothing, hair color, etc., they offer almost no flexibility for men's facial hair. They have a little "soul patch," a kind of slightly unshaven look, and a white Santa beard (not able to change its color). No option for us guys with full beards.