Environmentally friendly paper bombs with mustard seeds embedded in it in the shape of a green leaf. The leaf is handmade from recycled cotton paper. Give it away as a present when someone turns 50 years old. This is a Dutch habit :-)
The dimensions of one butterfly are 4 cm x 2.5 cm x 0.6 cm.
You can wet the paper and put it in the ground with a thin layer of earth over it. You can plant the leaf in springtime or summer and after several weeks you will have cheerful flowers blooming.