You may use a combination of different kinds/colors of hominy and cook them together in 1 pot. However, the different colors will cook in slightly different times resulting in different consistencies. The blue or red hominy will break down more during cooking than the yellow or white kind. Posole, like many stews, improves with age, so cook ahead of time and reheat. It also freezes well. Native corns are available online and at most Latino markets.