Spices in blueberry pie

Vote with grated or candied lemon peel. Lemon peel is also divine in a blueberry crisp topped w cornmeal. The lemon peel (strips of zest) candies in the oven. Cornmeal is mixed w other ingredients including sugar, natch. Maybe some cinnamon, but all that lingers on my mind's tongue is the warm blueberry, mild cornmeal crunch, and the candied lemon peel...

I put lime and mint in my blueberry pie.

Bay + vanilla. Infuse the cooked part of the filling with good bay leaves. Let sit several hours. Add vanilla right before putting into crust. ;o)

I like blueberry with vanilla and lemon
Or coconut
And cinnamon

two additions to the good ideas so far. Mint, if you'll consider herbs for flavoring. And some citrus - lemon, orange or lime - if you're using cultivated berries, which tend to have less flavor than wild.

How about some herbs? Lemon thyme, lavender, or tarragon are all nice with blueberries.

I like nutmeg with blueberries too. Five Spice powder also works well if the blueberries have a sturdy taste, not frozen too long and lagging in taste.
http://en.wikipedia.org/wiki/Five-spice_powder

Cinnamon, nutmeg, allspice are safe bets -- but I've done a cinnamon, lemon zest, and black pepper combination before and liked it, and also rosemary is interesting and good.

I like a little bit of nutmeg in my blueberry pie.

Ground cloves pairs well with blueberries