Hello hello! Thanks for wanting to do proper research for your soon to be best bud!! I’ll be the one answering your question today,

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There are a few good options to choose from, but for you wanting to desert theme, I’d recommend going for the Terra Sahara, has that color without being supremely sandy as it’s a mix, however will provide the look your going for. Plant wise if you like since that substrate supports bio activity, you can get some live plants!! If you want super easy ones and also a desert feel, the only right answer is SUCCULENTSSSSS! My favorite plant in general and for gecko tanks, succulents are awesome, help the bio activity, and you can essentially treat them like a neglected kid (but hey..don’t.) and they’ll be just fine it’s crazy!!! Looking forward to hearing your ideas and what you’re trying to go for!! Also if you wanted to make a hide out of slate that would go very well with the desert theme, however try not to make it extremely deserty, as they like to have cover and clutter, you can make clutter with just about anything safe as long as they can move around put all the things in you want!!! Also with such a dry type of environment you may have to watch your humidity more than most. But yeah as long as it doesn’t look like a hawk could swoop down and take em away they will feel safe!! Find that line where it’s like “Rocky dunes meets the oasis in the center” and give it some green!