Week 5: Miniature Catapults

http://www.budaiorigami.hu/index.php?lang=en&id=catapult

http://en.origami-club.com/fun/catapult/index.html

Week 4: Football Shirts

http://members.tripod.com/cecilia_liu/shirt.htm

Week 3: Ever-Decreasing Boxes

http://www.origami-fun.com/origami-boxes.html

http://www.origami-resource-center.com/origami-boxes.html

Week 2: The Best Paper Aeroplane Ever!

http://www.exploratorium.edu/exploring/paper/airplanes.html