Looking to create your own? Or can I possibly help you with your idea? Why not order a customisable keyring, magnet, or necklace?
It comes in a plastic sleeve with bubble wrap for extra protection. 
 
How it works:
 Please send me the image or your desired content via email (craftyourpopculture@yahoo.com). I'll send back the picture of what it would look like in the circle shape for your approval. Once approved, I'll proceed with creating your order.
 
   Keyring
Measurements
* Length (keyring and pendant): 6cm.
* Keyring loop diameter: (2.5cm - 3cm).
* Pendant diameter: 3 - 3.2cm.
Materials
* Domed-shaped glass that is quite durable.
* Zinc alloy backing.
* Iron keyring.
 
   Magnet
Measurements
* Diameter: 3cm
Materials
* Domed-shaped glass that is quite durable.
* Felt
* Magnet
 
   Necklace
Measurements
* Length (necklace and pendant): 24.5-25cm
* Pendant diameter: 3 - 3.2cm.
* There is a chain attached to the clasp of the necklace to allow varied lengths.
Materials
* Domed-shaped glass that is quite durable.
* Zinc alloy backing.
* Faux leather necklace.
 
Note:
* Colours and photo quality may vary depending on the device you are using.