I did it! I made a book using 12x12 designer series paper from Stampin' Up. Sorry, this paper is retired and i have no idea what the name of it was. I used kraft and chocolate chip paper, too. I used my brand new The Nicest Things set, which I love! And I also tried out the watercolor pencils and aqua painters on the watercolor paper. What fun! I can't wait to do some more watercoloring with the stamps! (using StazOn ink!) Here are some pictures. This would be a great size for gift cards, wallet size photos or bookmarks.
Click here to see the video tutorial where I got this idea!