These are made from 12 slotted flower shapes that fit together to form a sphere. No adhesive needed; the only ingredient is paper.
If you want to hang your ornament, you might like to add the string before assembling the ball. I placed a piece of tape on the back of one flower so the hole wouldn’t tear, then used a needle to pull string through, forming a loop on the front side. I secured the ends of the string on the back side with another piece of tape.
Use the slits to join petals together. Keep adding shapes, connecting as you go, so that every petal is connected to another petal on a neighboring flower.