You can start with the basic cupcake mix and let your imagination run wild!
A quick variation: replace the marzipan decorations with pistachio paste, which gives a more realistic saguaro cactus colour.
For that real Arizona touch, the sun should make an appearance on the cupcakes, maybe as a small circle of yellow marzipan at the top to left or right of the cactus? Oh, well - for next time.