I have seen lots of people recycling security envelopes in a lot of different ways. I was feeling punky (I have a cold) and I wanted a quick little project to keep my brain occupied a bit, and here is what I decided to do with the hundreds of envelopes I have saved. I used a manilla file folder for the cover of the book, and a simple pamphlet binding technique. I used some stickers and actual pieces of envelopes for the decoration on the cover and on the inside. In all the notebook is 8" tall and 4 1/2" wide. I used another piece of the folder to create a pocket. I simply took security envelopes, sealed them, then cut three sides off to open them up. I stacked them, I used 10 envelopes, and did the pamphlet binding. I then went back and covered up some of the writing on some of the envelopes with pieces of other envelopes. Some of the windows I covered from the back side so that they would show through. I am putting this in my purse and am going to use it to jot down those notes you need to jot before your brain forgets them. Stay crafty, My Friends!