GUATEMALA: Thousands of Catholics in Antigua, Guatemala join together during Lent each year to make colored sawdust carpets in preparation for Semana Santa, or Holy Week. In 2014, they broke the Guinness Book of World Records and made the longest sawdust carpet ever, at an astounding 6,600 feet. In class, the art teacher drew stencils in pencil on colored bulletin board paper, and then students filled in the designs with colored sand. For more images of the real thing, see HERE.
This video shows what the process looks like (note: there is no sound).