i did a circle journal on 2 peas..
some girls just used a small regular album - like the CM 7X7,
I personally bought a cheap spiral bound at Mike's took out the spiral and used fiber to la e up the pages for a kewler look!
It would be just as easy to make your own book and use fiber/ribbon.
Some of the cj's got REALLY bulky and the fibers wouldn't hold it together well - so make sure it is a strong fiber!
you have enough pages in the book per person in the group (example ours has a two page spread for each person (there were 12 of us if I recall correctly) so I made mine with 28 pages... I did an intro page explaining what my cj was about, then I had two pages for sign in where I made a pocket for tags and everyone filled a tag out with name, address, email, etc...
I LOVED doing the cj cuz it helped me with my all about me album - I would duplicate layouts
I would love to do another one - but some of the people on 2peas were flakers and it made it a nightmare - for 2 months I never thought I was going to see my cj again!