Neon signs are one of the oldest types of sign designs used and is only limited to the imagination. With this type of sign, glass tubes are bent into the design chosen by the customer. They come in a array of colors and sizes. They are for both interior and exterior use and are usually mounted on a Plexiglas or metal background. They are lighted from a transformer mounted close to the neon unit. Neon designs are also used as borders and accent pieces on many buildings to attract attention.