Yes, they are fun!
I just added some to make some beach sand sparkle. I don't have pictures right now as it in a Fat Quarter Challenge at our LQS.
There are tools to help get them right in place. The crystals come in little containers. Work over a piece of white paper and slide the run away ones into it when done.
There is also a system to add them using the scan*ncut machines.
https://www.brother-usa.com/supplies...-E9AD557C6C27=[Rhinestones]
I plan on taking a class on the technique the next time it is offered.