If you do strip work where you sew strips together and cut them to make things like rail fence or spider web etc you can use the cut off sections as long as they are at least 1 1/2" wide and add them to your confusion work. I use strip work for borders on my hotpads and I keep the cut off parts and use them to do confusion with.
In effect you are making your own fabric. You can keep adding more sections and more strips until you have a piece as large as you want it to be. You could in effect make a whole quilt top this way if you chose. Just keep adding til it is big enough. When you get a piece made that is as large as you want it to be just use a template and cut out the square or triangle or whatever shape you like.
You can use this and cut out appliques for a dog body or cat body / Bells with Christmas fabrics / or what ever you choose to do with it.
Just look at it as any other fabric you have bought and use it accordingly
Here are some of the things I have made with this method
5" x 8" mini quilt
Checkbook cover with embroidery