If you have no idea what I'm talking about... you should definitely go check out the tutorial for the basic model of the book. :)
If you need more than 10 pages, just add more paper bags. I've bound up to 9 paper bags together (for a total of 34 pages), with no adjustment other than to lessen the needle tension a bit on my sewing machine. You'll want to be sure to alternate the folded bag end (the bottom of the bag) to even out the bulk, and then instead of pages 5-6 being the center spread with one continuous piece of paper, whatever pages end up on the middle bag will be the center spread (not that you couldn't have figured that out on your own...).
changeable photos like a traditional photo album, cut pieces of plastic sheet protector to 5x4.5 inch rectangles. Sew one of these rectangles to each of your 5x5 squares (along the sides only, since you'll stitch the bottom later) to make a clear photo pocket before gluing and sewing the paper squares into the book. Be sure that the plastic piece is lined up with the bottom of the paper so that you'll close the bottom when you sew your paper squares to the paper bag and leave the top open to slide pictures in to.
wrap-around closure tie, just use a single piece of ribbon or twill tape that is at least 20 inches long. Instead of securing the tie when you are attaching the book cover, you'll secure it when you bind the book.
fabric cover (embellished or not), you'll need a piece of fabric at least 2 inches larger in length and width than your paper bag -- about 7"x13" or larger. If you're embellishing, embroider/applique/add your fanciness on the right half of the fabric, keeping your design at least 1.5" from the edge of the fabric (unless you'd like your design to fold over the edge).
If you have Wonder-Under (double-sided interfacing) around... use it here. I made my fabric cover before I had discovered the magic of Wonder-Under and I nearly drove myself insane trying to keep the fabric in place as I sewed it to the book.
pull-out tabs to include more pictures, journaling, or whatever else, you can print my template here. You may need to trim the top or bottom of the template to fit your book since your sewn lines might be different than mine or your paper bags a slightly different size.
You can also scrap together tabs by using a 4.5" square of cardstock (trimmed as needed to fit in your book pockets) with a tab attached. Make a paper tab by folding a 2"x1.5" piece of paper in half (hot dog style) and attaching it to the cardstock square. Or create a tab 1-3 pieces of ribbon, 2-3 inches long, folded in half and either stapled or tied to the cardstock square, like Katie does for her mini book/card.
Each pull-out tab will slide in the pocket created by the open end of your paper bag pages. Only one end of the bag is open (duh!) so...
more pockets for pull-out tabs, carefully cut off the bottom of the bag (a rectangle) before assembling the book. Begin by trimming the two long edges (so you can slide your hand through like in the photo) and then the two short edges. At this point, your bag will look like the bottom of the three pictures to the right. To finish your alterations, just fold the former bottom flap back out straight (to the right in the image), so that the paper bag is just a flattened tube of paper, and trim any excess paper. Then stack, fold, and assemble your book.
Also, please note that the paper bags aren't acid free. As long as you have your acid-free scrapbook paper between the bag and your photo, your photos will be protected, though. The only photos that will be at risk from the acidic paper of the bags are the photos on your tabbed pull-outs in the pockets -- and even then, they'll be safe for at least 5 years. Just be sure you're not putting a one-of-a-kind heirloom print in there.