These are for fun and decoration. They're the same as the badges we put on the bikes but they don't have the curve that allows them to sit flush on headtubes.
The Bombadil one is bare, but super glue a magnet to it and stick it on a fridge.
The Platypus one has 3M double sided tape. It would make a good hood ornament or a deluxe bumper sticker.
The Bubbe one has two pins for sprucing up a saddlebag or coat.