I was in Frankfurt last week and prior to boarding my return flight to the U.S. on Singapore Airlines , I visited one of Lufthansa's many lounges at their home airport.
Holding top-tier elite status with United granted me Star Alliance gold status, with which I was able to access Lufthansa's Senator Lounge — an upgraded offering from the "Business Lounge" I'd normally have access to as a business class passenger flying Singapore Airlines. Singapore itself doesn't operate an independent lounge in Frankfurt.
This lounge — one of three Senator Lounges at the airport — is located near gate B42 and I took the escalator up to the main entry doors. Just inside and to the left, airline representatives have a long counter, where they assist passengers with flight arrangements and other requests.
Straight ahead was the "chic" portion of the lounge (pictured above) with hardwood floors separating various seating areas featuring low couches, chairs and side and coffee tables akin to a living room. The lighting in this area was more subdued and a long bar sat off to one side.