When I want to kick it up, I like to add hardwood chips or chunks to the grill; it adds bold smoky flavors. The most common woods are hickory and mesquite, but you can find alder, apple, cherry and, my personal favorite, pecan.
Wrap fish fillets, sliced veggies, and other quick-cooking items inside foil packets with bundles of fresh herbs and throw them directly on the grill; the steam will release the herb's perfume and flavor anything contained inside the pouch.
I've always been known for bold flavors and rustic cooking, but there is another side to me. As you evolve as a cook, you understand life and how serious it is. There comes a point where there's got to be a better balance.