As soon as I heard what the challenge was I went straight for my Bind It All!
Like many of you I save all the board I can get my hands on (packing materials, back covers of pads etc) as it is perfect for making the covers. For the inside pages I used a Post-it sticky note pad. I live in a busy household with a lot of comings and goings, telephone messages and so on. Post-it notes are essential for us to all keep tabs on one another but I do find that the pads are unsightly.
The width of my covers are six inches, I find that it is better to work in imperial measurements with the Bind It All as it is an imperial machine lol. I'm only mentioning this 'cos I ruined a good few projects before I figured it out! The depth was decided by the Post-it (sticky notes) pad. I then covered the bare board in K & Co paper before cutting the binding holes. I folded an offcut of the same paper to make the pen loop and stuck it to the inside back cover (checking the pen would fit first).
I chalked up the edges with Cats Eyes Liquid Chalk pads and then with the Post-it note between the covers I bound it all together. I then decorated the front cover with my chosen images, some flowers and brads.