This is a little trick I learned from World of Beer that is SO good either in blueberry beer (402's Blue, Sea Dog Blueberry Wheat, Fat Head's Bumbleberry, etc.) or a light ale.
Get yourself some fresh or frozen blueberries. I like frozen because they act like little ice cubes and dye the beer a bit pink. Plus, they thaw while you drink and are delicious treats at the end.
Put a handful in the bottom, carefully pour, and serve. So delicious!