That is how we made them:
Two deep bowls;
Two googly eyes;
Ribbons - diversity
Piece of double sided tape
You can paint or cover with pieces of tissue paper one bowl outside.
Make a few holes on the bottom of second bowl. It is very good exercise for children to lace ribbons through the hole. Do it as much as possible. Make a small hole on the middle of painted bowl and fix the thread with double sided tape inside. Fold them together and stack with double sided tape. Make a holes on the edge of bowls and let children lace them with the ribbon. Attach some more ribbons to the ribbon which laced edge.
Our jelly fishes didn't look so pretty but I love when they do lace for fine motor skills!
Those jelly fishes made by older children, who tied ribbons on the edge.