Originally Mardi Gras masks were worn by people who participated in Mardi Gras Runs throughout the town who caused mischief on the way. However as Mardi Gras has evolved over the years the masks became more about costuming and themeing instead of concealing your identity. While masks can be simple the most sought after masks are the most ornate and elaborate. You can find them covered with sequins, feathers, rhinestones, jewels and almost any other decorative material. They can also be found in shapes of butterflies, birds, and flowers.