Plant ideas for a mini vase

Hello all! A friend recently gifted me this adorable little vase, and I would love a succulent or something else that would stay around 6ish inches for its lifespan to potentially put in it. Maybe I’m completely clueless since I only have 3 plants (2 bamboo, 1 Christmas cactus) and it’s only meant for decor, but if I could possibly put a cute lil guy in there, it’d be awesome 🙂 It’s about inches tall but the mouth is pretty thin. Thanks in advance for any suggestions or help!