For our desert habitat we do a variety of fun art projects:
Here is a very cute cactus: mix epsom salt with tempura paint. It will create a really cute texturized look -- kinda like a real cactus. Add a tissue flower in corner...perfect.
Here is our desert habitat area: desert writing, sunset painting with coyote, cobra art, cactus, camels, etc.
**If you like these ideas you can purchase my desert unit here**