Need some Recommnedations/Ideas with my WIP enclosure!

So I've been slowly developing my 10 Gallon (20"Wide) desert beetle enclosure which will house no more than 6-8 beetles and I'm going for a Dark Souls inspired theme. My substrate is a mix of playsand and coco fibre with a slight moisture gradient!

The rocks and sticks in the enclosure were collected and boiled because I'm a worrywhart for pesticides. The things I'm lacking creativity in are hide ideas and something safe that would add more green to my tank that wouldnt be harmful to my beetles. I've heard of sphagnum moss but have been told it just turns brown in dry tanks.

The tank is still a big Work in Progress but I'd be super happy to hear some ideas from the BDFB community! :D

PS i know the screenshots from the game look a lot different from the enclosure and thats okay with me It's just inspo :)

https://preview.redd.it/gmmc4neoz8ee1.jpg?width=4000&format=pjpg&auto=webp&s=e4f7e76e80cf414975179580caf7c332498e4033

the moss in this photo was mentioned in another one of my posts on here and it didnt seem safe so i sadly had to remove it

https://preview.redd.it/1czi0yirz8ee1.png?width=1547&format=png&auto=webp&s=721ae3a3652354b6e513d099a60d017d807a9fb2

https://preview.redd.it/kn77xeesz8ee1.jpg?width=1280&format=pjpg&auto=webp&s=17226d3a9d3512015223b96c954158f514d12413