This is as easy as it gets. I found this dome with the flat place on the bottom {see last picture below} at a local thrift for $1.
I had the curtain rod end piece in my stash of junky stuff.
Used E6000 to glue them together.

I wanted it to be whimsical so the finial is kind of big for the dome.

I made the pedestal using this tutorial.
Here is another easy to do tutorial for making a cloche with stuff from the thrift and things around the house.