There are many more combinations you could come up with, these are just a few. To bind my book I did this...
I used 5 pages total, and used the pamphlet stitch to bind them to a spine piece of chipboard covered with patterned paper. I had 1/2" of space between each page, and in front of and in back of the first and last pages. So, I had a 3" spine. It made for a fat little book, but the space was necessary if you want to use bulky embellishments.
I hope this all made sense!
Stay Crafty, My Friends!!!