Hi Adrian,
Attached are photos of:
1. A joshua tree (Yucca brevifolia), an iconic species of the Mojave Desert.
2. Saguaro cactus, Cereus giganteus, iconic species of the Sonoran Desert and Saguaro Nationa Park.
Would you please make symbols of these? No particular rush - these will be used for a variety of purposes and I'll be out of town all next week. These pictures are public domain from the NPS archive. I can send more photos of either subject if this would be useful.
Thanks!
johng