Using your pinking shears cut out various images to play I Spy with. I use pinking shears to reduce fraying on the edges of the scraps.
If you don’t have pinking shears you can absolutely use rotary cutters for this just be aware you might have a few extra loose threads after the first wash.
You can use any kind of lightweight double-sided fusible product to prepare your I Spy Images for attaching to your quilt.