Flaked oats and flaked wheat add a sexy mouthfeel.
Light handed sterling hops.
My wit has won a couple golds and I spice with: sweet orange zest, lemon zest, grapefruit zest (use fresh fruit, not the dried packaged up kind), grains of paradise, cumin seed, coriander seed, and cardamom seed. It seems like a lot, but use all very lightly, and it creates a great spice complexity.
I like the lemon balm idea.