Here is a picture of a lobby sign we recently installed for Direct Mortgage Funding. They decided to go 3d letters on plexiglass for their interior office sign
We used 1/2" thick PVC letters painted in custom PMS colors. The small text "A Division of American Pacific Mortgage" is done in vinyl, because the text is too small for router cut letters. The 3d letters and vinyl graphics were mounted to frosted acrylic. And the sign is installed using 4 brushed aluminum pegs/stand offs.
Different styles work for different logo. And there is a sign for every budget. We fabricate custom lobby signs, so there is no set price or a catalog. The price is based on the materials, size, number of customer colors etc. All we need is your logo and the approximate size for your sign and we can provide an estiamte on the cost of your lobby sign.