A popular effect that's often requested, VU meters that move in sync with the audio track. Here's a good tutorial showing how that's achieved using the audio and quantize parameter behaviors.
The new rigging feature in Motion5 gives huge power to those who want to build their own effects for Final Cut Pro X. Andy Neil gives us a lesson on building an effect using widgets & rigs.
A few of us editors met up in London for a grande cafe latte and ended up talking motion graphics and how to add a bit polish to boring shots, products, text e.t.c. The general consensus was that you can't go wrong with lens flares, clients just love them!