I used stick on embellishment, and I have some sheets of decals that I've not put on yet.
I've found that over time, some of the crystals are popping off, but figure when I lose a lot of them, I'll just peal off the sticky and put on new ones.
the pink/white came as the design, the blue were singles that I added for fun.
I don't use this machine for FMQ so having them on the inside of the pillar is not causing problems. I've lost a few due to the stabilizer hitting that area when using the big hoop, so if you are going to have a lot of rolled up quilt rubbing that area, I would not put anything there.