Holi Yard Sign Decorations - Coroplast Holi Home Decor, Festival of Colors Sign, Holi Cutouts, Hindu Holi Festival Yard Decor with Stakes. Economical and durable, our Coroplast Yard Signs are a staple of outdoor advertising. These outdoor Holi Yard Sign full-color direct printed graphics are vertically fluted for use with a D Wire. Coroplast is typically used for yard, parking, real estate, and election signs. They are waterproof.