Envelope Book: from scrapbook paper, fabric, illustration board/cardboard, envelopes, and thread.
Make an accordion style book out of envelopes. (Made paper bag book
Envelope Books: Paper Binding How-To - Martha Stewart Scrapbooking & Memorykeeping
I absolutely love this idea. Maybe fill each envelope with something different and then wrap string around it to hold it all together.
Really cute idea.tutorial step by step how to make a fab envelope accordion mini book
DIY Envelope Book (And Love Coupons for Valentine's Day)
DIY Envelope of Love DIY Envelope of Love by diyforever