I made my busy book bag around fish, and I love the way it turned out. These little fishes all fit inside the clear vinyl fish tank, which I sewed directly onto a tote bag that I purchased.
I printed out the fish bowl (that I drew and scanned into the computer) on printable fabric and then used pellon to adhere it to the tote bag. Now you can print out the fish bowl on fabric with this template. Iron on Pellon. Then iron it onto the tote bag. You can use this template to make the fish as well.
I also made a set of matching card and put them in the little bag.
This PDF pattern includes the templates to make the fish bowl, fish, and matching cards.