Spray baking pan with cooking spray. Be prepared: these will stick more than regular crescent rolls.
Sprinkle 1/4 cup sugar on a plate. Open crescents and seperate. Lightly press each triangle of dough into sugar, turning to coat both sides.
Place a tablespoon or so of blueberries onto what will be the inside of the finished crescent and roll up as usual, making sure to tuck in any wayward berries. Place on baking pan and bake as directed on package
Eat as-is for a nice, light breakfast, or for dessert...
Cook remaining berries with a little sugar, vanilla and water. Cool slightly, then puree in food processor. Return to pan and thicken with paste of water and cornstarch if desired.
Serve crescents topped with vanilla ice cream, fresh blueberries and sauce on top.