Etsy has this great tutorial by Kayte Terry, author of the book Paper Made (available May 9, 2012). One of the things I like best about it is it's made out of cardboard!
Click on the photo to check it out. There are step by step instructions along with templates! What more could you ask for?
I will be trying this soon. And hopefully many more fun projects when her book comes out. I'm excited to see what other tutorials she has in her book. BTW it can be pre-ordered on Amazon.com. I'm just sayin... ;)