Origami Koi Pond
If you make a bunch of little origami koi, you can make a koi scene in a diorama or shadow box.
I used white and dark orange origami paper to make the koi, and lined them with foil. I then drew the spots on the fish with markers. You can learn to make this origami koi by Sipho Mabona in the book Origami Worldwide, which is edited by John Montroll and Brian K. Webb.