I don't like browned bananas so they usually get tossed in the freezer for banana bread or smoothies (they help make them nice and creamy). It's nice that you can just toss them in there whole.

Blueberries I'd probably freeze on a cookie sheet and then transfer to a ziplock bag or a container so they don't stick in one big lump. I love these for mixing into muffins and on top of breakfast cereal/oatmeal.
Apples I would probably peel and chop and make into applesauce (either on the stovetop or in a crockpot if you have one). I hear you can also make this into apple butter if you keep cooking it down, but I haven't done it myself.