My contributions to the renaissant Petty Gods project now being spearheaded by Gorgonmilk are very much inspired by the myths and gods of Mesoamerica. I have submitted two gods and a divine minion creature for the project, as well as a number of divine items, some of which are Mesoamerican-inspired.
When I say Mesoamerican-inspired, I mean inspired by references like The Gods and Symbols of Ancient Mexico and the Maya, by Mary Miller and Karl Taube, by relatively historicist and immersive RPGs such as Chad Davidson's Heirs to the Lost World, as well as by more fantastic sources including Eric Von Daniken, Jack Kirby, and M.A.R. Barker.
Of course Ivan Van Sertima needs to be in the mix too.
My next setting extension for Spears of the Dawn and Everway is what I am calling Xeno-Meso.
It is an "other" Mesoamerica (and as in the picture at the top of the post, will probably include an analogue of Mississippian North America as well) that combines analogues for some of the historical Mesoamerican cultures (such as the Aztecs and the Mayans) some of the more speculative ideas about the prehistory of the Americas, such as the "Black Olmecs" hypothesis about the West African colonization of Mesoamerica.
Should be fun.