Mate go to www.coffeegeek.com and ask in the forums there if anyone has got great pictures of foam.  Mark Prince (aka Coffee Kid) who runs the site takes awesome shots, if he'll send you some texture shots you'll be laughing.  Bear in mind he has some serious espresso machines at home including a full on heat exchanger La Marzzoco.

Oh they'll also be able to point you to the best coffee shops near you ;)