What paper should I use?
Any paper available, that can be made to square size, preferably A4 size or similar. Usually colorful papers are used, but plain white with your sign on the wing is good too.
This is a nice project. As an AIESEC Japan alumni, I want to support this origami for Japan. I make origami cranes at the pub in Kyoto city named Zen Cafe.
I hope that this project will cheer up people suffering from the big earthquake, tsunami and nuclear plant issues.