No pictures, but dining rooms and other public areas were generally converted to house mass numbers of sleeping soldiers. Other rooms became dining halls. Suites and staterooms generally lost their fittings, although some of the finer first class suites evidently retained a bulk of their furnishings, and I know of one famous room that was used a number of important times during the war, in its plush condition.
The á la Carte restaurant retained its panelling (boarded over) until spring 1917. Meanwhile, the first class gymnasium retained its outfit and was available for use until at least 1915.
Best regards,
Mark.