The Wild Magnolias are one of the New Orleans Mardi Gras Indian 'tribes'. Here's a page on parades, spy boys, flag boys, and 'Hey pak-e way'. Satchmo.com: Running the streets of the Crescent City.

Here's an intro to the costumes and customs of the Mardi Gras indian tribes Mardi Gras Indians of New Orleans

A google search under Mardi Gras Indians will turn up more.