Hello!

I've been thinking about ways to go about environmental enrichment for a ball python ― Obvious ways are a big enclosure with lots of clutter and hides, plants, different levels, perhaps different substrate etc; as well as changing it up now and then (say, once a month removing an object and adding a different one, or switching places of two objects, small changes that will create something "new" to explore but wont stress out the animal bc everything is drastically different all of a sudden).

And I've heard about people talking about using scents! Like sprinkling some bedding of bunnies/mice/etc or putting a foreign shed in the enclosure (confirm? is both of this okay?). Or using fruits or other scented things to rub over an object, without leaving the actual fruit in the enclosure lest it gets messy haha!

―And that's what my question is about! What can and what can I not use? Obviously pine and cedar are no good, we all know that, and I've heard anything citrus is bad too?
Can I use herbs, like sage, or parsley? Mint? Various non-toxic(!) flowers? Or is that all, if moderately used, still too strong?

TL;DR: What other things, besides pine and cedar, are no good for a snake? What could work for scent based enrichment? And any other ideas on environmental enrichment?
Sorry its such a long post!!