Apparently Razer are making similar cat ears for their headphones, so I made some which should fit on any headphones with an over head band.

Print the ear pieces and optionally can colour change @28.2mm to get the rim a different colour.

Get a pair of thin hair bands/bobbles and superglue them into the slots on the backs of each ear. These bands can wrap under the headphone band and hook onto the little hooks on the bottom front of the ear. https://www.amazon.co.uk/Piece-Bobbles-Elastics-Black-Metal/dp/B01M7QL0KU/ref=sr_1_3_a_it?ie=UTF8&qid=1520589807&sr=8-3&keywords=bobbles+thin+no+snag

Kind of silly, but it was a spontaneous project I thought up for a friend =]