They must be popular since the site says "Sold Out."
They look a little like the "prizes" we used to make, usually at Xmas time rather than Easter, by gently splitting an English walnut open at the seam, and replacing the meat with a "prize" of some kind. Reassembled with "Duco" model airplane glue, and mixed back in with the real nuts. (Most of the adults learned to check for the ones that rattled, so they didn't get all the kids' prizes.)