The Texas photographer has been obsessed with potty humor since he was 17.
That's when he noticed 80 brand-new toilets sitting outside an apartment complex under renovation.
Now, he's put together the 2010 "Random Sittings" calendar.
Gregg has pictures of people on commodes near the Texas Capitol and all around Austin.
The calendars cost 15 bucks each.
Part-time model Niki Pham tells the Austin American-Statesman she posed on a potty, because it's cool and funny.