Everyone has lulls in their workflows- periods where the volume slows down a bit. While its nice to stop and take a breath, its also a great opportunity to look at your back-burner projects.
Make some calls. Schedule some lunches. Take the online tutorials you've been meaning to learn.
The key is to always have things on the back-burner list, so when the opportunity presents itself you have lots of ideas other than "Cruise Facebook". You need a plan for the slow times, too.