I'm still playing with security envelopes when I get a chance. Had a really fun day when friend Chris came down from Indianapolis to Gaye's house and Gaye showed us the book she was working on. Chris and I made one like hers, using cardboard envelopes as covers and security envelopes for pages. In the photo, ours are the two standing in the back, and Gaye's book is in the front, showing the inside.
I'm also still working on my book that I started a couple of weeks ago. Mine uses cardboard from a priority mailing box for the cover and security envelope pages. I finally sewed it last night, using the sewn-on-tapes method.