We just returned from the Beach Club (BC) and really loved it. Never been to YC.
Not sure what you are looking for in toned down colors but here is what the BC had.
Walls had white trim with light blue walls on top of off white wall paper. The drapes were light beige. The wall paper and drapes had blue and brown nautical designs (sailing ships, bouys, light houses).
The lobby had the blue and white motif. The staff was dressed in the same light blue and white.
Not sure what the YC looks like, but I hope this info helps you out a bit.