These are origami or paper designs that I particularly like. Usually what makes them awesome is that they use paper alone and don't require adhesives to function.
Free licenses preferred, but include whatever you like and send a PR! 👋
https://www.youtube.com/watch?v=H-IwYLkcpog
http://www.homemade-gifts-made-easy.com/make-gift-bags.html
This list is CC0 -- do as you'd like with it. However, each design is under its own respective license.