I made doll plates from the little pull tabs that come on juice cartons.
Pull that little tab off and you end up with the plastic bits on the left. I carefully sliced off the top ring and it ends up looking like the plate on the right.
I then printed some pictures of plates off. I just googled something like "china plate" in an image search.
I cut them out and used mod podge to glue the paper to the plastic.