How can you make a paper banana?

for chem i have to make an "ornament" to show the element...i chose potium. then i have to write a 4 page paper about it. anyways, i chose potium and decided to make a paper banana. i thought it would be very creative to make it out of construction paper and make it 3d...well i have the stem done, but its kinda hard to create the actual banana. does any one have any ideas?