The Franklin room is the one that's used most often of all the rooms.  
It's usually used as a dining room.  Note huge seal on the ceiling and 
the enormous one-piece rug, made on a loom in New England.  Also, the 
gilding at the top of the columns are real but the columns are 
fake--they're not actually marble; they're scagliola.  The seven floors 
below weren't designed to support the weight.  (These rooms were 
originally office building rooms that were later converted into proper 
reception rooms.)