3-dimensional lettering in your lobby can make a very professional first impression. Using light weight materials that have the look of being very substantial can be surprisingly inexpensive. One of the more popular type of materials like this is a 1/2" thick rigid pvc black foam board laminated with a brushed gold or silver aluminum.
The 1/2" thick black edge gives the letters depth and the brushed gold or silver finish aluminum gives it a classy look.
If you have a logo to display in your lobby, all the better, but even if you don't have one, your name alone in 3-dimensional lettering still makes a statement. Think of it as branding your lobby.