Do you also collect plastic caps? One of the possibilities of what to do with them, in addition to recycling, is the possibility of creative creation.
With help 3D printers, which sooner or later will come into every home, you can make a plastic net, for which you need 12 similar stoppers. The result is a vase made of bottles. They are available in the online store in black and green, and the price for the net is an irrational 175 US dollars.
Info Box
More information at:
www.layersindesign.com/screw-you-vase