Custom monument signs are designed to match your building architecture and provide clients with a first impression of your business or property. Most are constructed using a variety of metal and acrylic materials, can be illuminated to highlight premier tenants and are positioned for optimum street visibility. Affordable foam monument signs offer a unique cost effective alternative and are made using a light weight durable foam core with a polymer exterior hard coat. Can you pick which of these beautiful ground monuments are made from foam? Click here to view other alternatives. Exterior Signs, Channel Letter Signs.