We'll start with the cholla cactus:
That's me with my arms wrapped dangerously close to a teddy bear cholla. This monster makes its first appearance in the early chapters of Fire, when Cesar is trekking through the Sonoran desert. They're nasty buggers with gazillions of spines and you want to steer well clear of them.
Next up is a patch of prickly-pear cactus. These are a little more common around the US, and I wouldn't be surprised if they exist on other continents as well. I've seen them in Colorado and I believe I even saw a patch in Virginia once. They get really big here in Arizona - I've seen pads the size of dinner plates on several occasions.
That's it for now. If you like what you see, let me know and I'll take some more pics next time I'm out - maybe even a Javelina if I'm lucky.