First I made a reusable trash bag for my vehicle. I took 2 cereal box liners and opened them so that they lay flat. I scattered some red crayon shavings between the layers to give it some color. After fusing them together, I sewed a seam down the back, and across the bottom. I sewed across the bottom corners to make a flat bottom, but that is optional. I rolled a hem at the top to make it look finished.
Second, I made a new makeup bag for my thirteen year old daughter. For this I fused two bags like above. I cut a heart out of a silver liner that I had and sandwiched it between the layers. This time I fused the back seam, and the bottom seam, then hot glued some velcro as a closure.
My third project was for teen girl too. She has been begging me for a Capri-sun bag, but I thought a Cereal purse would be just as much fun. I used three liners this time. I cut pieces off of 2 cereal boxes for the front, bottom, and sides. First I glued the cardboard to the fused plastic, then sewed around the pieces.