I would go with some kind of neutral hop like Goldings, unless you want some citrusy notes. I think the blueberry flavor and aroma will dominate any hop that you would add. Just go with Goldings to about 30 IBUs.
I'd go with a bittering addition only, with a more neutral hop like Hallertauer. Leave as much room as possible for the blueberry aroma and flavor, without competing with any strong hop flavor or aroma.