I would make some sort of turntable out of it. Maybe a stool, a steering wheel for a hot rod, rig it up to a motor so you can watch it spin, a clock, I could go on with some stuff for that.
SKF #nu230 ec has a 150mm (5.9") bore diameter and a 270mm (10.62) outer race diameter.
It is bigger then pocket size but not as HUGE as it looks in the photo.
I would make a clock out of it.
Mark