Did you ever make paper flowers as a kid? I did! I had this little machine that did the whole thing for me. I never knew that I could make them with egg cartons. Eggs cost a few dollar and now you can use the carton for a creative re-purposed craft instead of just recycling it.
I was able to dig up the source on this one but it does require translating. There’s many more photos though that should help you if you get stuck.
Here is the link…
Image Credit: blog.naver.com