Place a glass of about 3 tablespoons of water nearby for sealing any cracks. Add any leftover blueberry juice and stir. Also, set aside a pastry brush.
Using a pizza slicer or sharp knife, cut the dough into 8 slices.
Using a pastry dough scraper, lift the dough away from the circle. and add a short row of blueberries at the widest end. Roll the largest end to the smallest end into a croissant. Bend the croissant into the shape of a crescent moon, if desired.
Using a small whisk or fork, beat together the confectioners' sugar and cream. Pour over hot croissants and allow them to set 2 - 4 minutes before serving.
Eat and enjoy!
Just realize that as you roll out the dough, even if you are only rolling it out in one direction, it will also become wider in the other direction. So, you'll need to constantly push in the other side to keep it from widening.
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