While recovering from pneumonia I've been doing some origami. When I was a kid I did a lot of origami. My parents weren't the types of people who spent money on toys or games for me and my siblings so we had to learn to have fun with what we had around the house. What we had around the house was PAPER - lots and lots of paper. My dad would bring home stacks and stacks of paper from his job at the university. It was waste paper so it had printing on one side but we didn't care. We used it for drawing and painting. We cut it into shapes and we folded it into origami. For instructions we used an old origami book called "Origami Animals and Fishes" that must have come from a garage sale.
Over the years I've continued to fold origami now and then - a paper crane here, a folded box there, but never anything too complicated.
I've also tried my hand at folding dollar bills into various origami creations. These days a guy named Won Park is designing some wonderful dollar bill origami. I fell in love with his dollar bill koi and had to give it a try. Won's koi is rated "complex" and the folding diagram has 60 steps!!!!! Luckily, Won provides 8 sections of online video instruction for making his koi. Without the video help, I would have never been able to complete the folding. Here is my origami koi. It's much less wonderful than Won's koi, but pretty good for my first try, especially since I was on heavy painkillers while folding.