Inspired by Ww Peach Angel Food Cake. I found that the blueberries and juice get more evenly distributed than peaches do, for more fruit flavor in every bite! Note: This works best if you have the 1-packet type of angel food cake mix. If you have the 2-packet kind, you can empty both packets into the bowl together, but you may end up with a slightly denser cake. Feel free to try this with other kinds of fruit in juice. I'd like to know how it turns out! I've already made it with pineapple, peaches, and blueberries. I might try strawberries next....