Some people have used glue to attach the eyes to the fleece, but I haven’t had much luck with it, as the edges of the eyes would sort of lift away from the fleece. But I was probably using the wrong type of glue. It would be good to experiment with different adhesives. For filling in the eyes, I bought some expanding foam from the hardware store—the kind of stuff used to seal around windows, etc. It comes in a can and is sprayed. When dried, it’s very easy to trim and cut with a knife, and basically looks like a rigid foam. However, certain adhesives—like contact cement—will eat through the foam. I’ve heard of some puppet builders using hot glue. Might be worth a shot!