I made blueberry ice cream the other day and was left a pile of cooked blueberry hulls. What to do? The chickens might like them. It is hot out, so freezing them might be good. I put the strained skins in a paper bowl and popped it into the freezer. When I put out the block of frozen blueberry mash for the chickens and they devoured it. I was hoping for purple stained beaks (frozen blueberries stain my hands something awful), but they were quite clean. It does go right through them, though, so for the sake of their fluffy bum and digestive tracts, blueberries will be a sometimes treat.