I just got over a case of the creaks, and as it turns out I had a laundry list of creaks. It started with pedals, I repacked the bearings and they quieted down. As soon as that noise was gone I was able to hear the creaking coming from a loose chain ring, I pulled the bolts, greased them, and reinstalled and that solved my issue. Next was the non-drive-side cup for my cartridge bb, it should have been equipped with a plastic cup, but someone used a metal one which was causing some intermittent creaking. A quick change out to plastic and I am now as quiet as a ghost rolling down the road.
The point of all this rambling is there are many things that cause creaking and the bb is generally at the bottom of the list.