I usually put bananas that are just beginning to go over in the freezer. They go really black and when defrosted look a bit grim but it gets all the banana flavour out. I then make this cake (I use 'proper' chopped up chocolate rather than choc chips and don't make the crumble topping) along with some icing (8tbs icing sugar, 2-3oz butter, 3-4oz milk chocolate) in the middle and on top. Delicious and never lasts long in this house!
Chop each banana into 4, wrap in clingfilm and freeze. Then use as the basis for a smoothie, adding other fruit, yoghurt etc. The frozen banana gives the smoothie a lovely ice-creamy texture (it's very noisy in the blender though!) I sometimes make a yummy breakfast one with the banana, some milk, a spoonful of drinking chocolate and a spoonful of peanut butter. Not for those on a diet though!