These cholla cacti have the coolest 'skeletons' as they die. I've picked these up on a few hikes in the Tucson area and finally got a good cast of one. I used this cast cholla to form this ring band.  Size 5-11 
This ring is sized when ordered and may take an extra couple of days to ship.  
 
Details:
Recycled sterling silver
Finish: oxidized
Sizes: 5-11