A pendant designed to hold your favourite guitar pick. Do an Internet search for "guitar picks" to see the thousands of designs available. Here's a link
to some I found on Pinterest.
Holds a standard sized pick (not over-sized or "shark-tooth" size).
Held in place by a friction fit underneath the bail. Simply push from the front to remove and swap out for another design. Of course, if you want to make it permanent you could also glue it in.
Lots of colours to choose from.