Hang them or set them somewhere and enjoy them as you catch sight of them. They are beautiful!
The recesses formed make interesting nooks to tuck small gifts : handmade truffles; Dinky toys; garden seeds for next year's planting; smaller hyperbolic crochet; etc.
Three of the density of the orange one (last two posts) make unusual juggling balls; four would make the act of juggling more challenging and elevate it to an artform.
Toy for a baby.
Strung together in same or varying sizes – what a scarf!
An accessory such as a pom pom or flower brooch or buckles for shoes.
A teeny one attached to a hair elastic could be a ring.
A larger one attached to a larger hair holder could be a bracelet.
Other ideas………??????