I keep picturing a swampy Yuan-ti kingdom toward the south, were human and orc peasants are little better then slaves, with lots of snake-inspired architecture (Set worshippers?) like what is seen in Todd Gamble's Map Folio II. The man is a must-have for any maps that would be done in an official product.
Almost all the maps deal with sections and buildings of an Aztec-like fortress city. While this would be great for a Maztica campaign, or a single CoC adventure.