I think you will also find mate that banana's are all different shapes and sizes...and even colours....I think going for the PERFECT shaped banana will just make it look like a generated thing...having a few flaws in objects is not always a bad thing. Hope you havent stopped making it???

cheers bullet

as Mastone pointed out...Google some more...thats how I learnt basic UV myself....there are plenty out there.

I did this in half an hour with just a pentagon face and extrusions mate..then I would use PS to texture it.