I have a few real sheds that are displayed in my bookcase... but this is my attempt on a faux pair:
I started with air dry clay. I grabbed a couple of branches from outside to mold the clay to.
In the background you can see my inspiration picture on my iPad.
I used some tin foil to wrap around the branches, to give them a little more shape..
Here is the finished product (after painting 'em) next to my real ones...
I think eventually I would like to mount them on a faux skull cap, to make it look a little more like this:
Or maybe go a little over the top crazy like these: