BSA tells more about Huichol Art: Transforming A Vintage Beetle in Mexico (2010):
For this piece eight members of two Huichol families took the task to create a piece of art, seven months in the making, by using more than two million glass beads and a vintage Volkswagen as a canvas. Inspired by the designs of Francisco Bautista, a patriarch of one of the families, they incorporated their traditional indigenous theologies and cultural symbols with modern vernacular.
The web is loaded with information about the Huichol people and their culture. Here is a wonderful general resource page and google's image page and (thanks to Taska's tip) some traditional music.