This might have been suggested before, dunno. But hear me out: thylacine markings. Y'know, the back/butt stripes. Like on this illustration of one here

Since it's an extinct animal, this could be an applicator you could buy during the November event! I imagine it could come in many colors like Onyx, Noctis, Ebony, Brown, Dark Brown, Black, maybe even some rarer colors like Elysian! How does that sound?
Mockups coming soon!