For the greatest impact, materials can be mixed. As in the top photo, routed aluminum can be affixed to a black PVC backer. The lower example shows that dimensional letters can be combined with an acrylic, aluminum or steel base. Aluminum stand-offs can be used to attach the sign to the wall, adding depth and further enhancing the overall effect. There are many, many options to consider.
Below are examples of signs whose prices range from $1,200 – $2,800. (prices can vary greatly based on many factors including the size of the sign and the thickness of the letters and back plate)