It all depends on what you consider too big so maybe you would love to turn a Funko Pop keychain into a necklace. I personally think they would be too heavy for earrings but I think it would make a cute pendant that you could wear on a necklace. Just unhook the clasp from the keychain part and put it on a necklace.
Depending on the hook you might have to add a piece. I spotted a Hello Kitty keychain that would work as a pendant but it needs a bail because the hook is facing the wrong although two of them would be perfect for earrings. This is a simple way to make some cute and fun jewelry.