Fake plastic plants work well, especially from craft stores, but go over them with a fine-tooth comb to ensure there are no exposed pointy wire ends or enclosed loops your snake can get stuck in. I remember reading that one guy had his snake get stuck in the plastic wire loop used to attach manufacturer's tags or a price tag, but the documents had been ripped off and the loop was almost invisible.
I would avoid anything absorbent as excrement tends to soak in, and that's almost impossible to clean.
Cleaned rocks are great, just set them up so they are stable and can't fall and crush your snake.
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