Interchangeable Classroom Sign. The "Welcome to our Classroom" sign is big enough to hang outside of a classroom door yet small enough to decorate the interior of a classroom! The sign comes with your choice of 1 interchangeable piece. Additional pieces or custom pieces can be purchased from my Etsy page, GiftsbyKGray. The base of the sign is made of whiteboard and thin wood is used for the lettering. The background of the sign has horizontal lines, a vertical line, and 3 engraved circles to mimic lined notebook paper which can be associated with school. Rainbow letters offer a bright and colorful touch to the door hanger or a more classic look can be achieved with black lettering. Interchangeable pieces are attached via small, white, velcro squares for easy application. A simple wood device and jute string are used to provide a hanging mechanism for display. Current interchangeable accessories are: an apple with the word "learn", Earth, stack of books, bookworm, and a paintbrush.