I have not made one but I would suggest anything that can be permanately sewn by machine would be best since they will get a lot of use. I would sew in a nice metal zipper, maybe beads on a fabric strip that has the ends double sewn into seams. Keep the beads small in case they are pulled off so they do not a choking hazard. A nice piece of long fur to pet would be good. I also thought the marble maze might work in a fidget quilt. I think QuiltingNan showed pictures of her mazes done for children.