This is awesome. It’s cool to get beyond the confines of the recognized skilltoys and just trick with whatever random object you have. At my last job I had a set of keys attached to a carabiner, and after a few years of working there I could do all sorts of little aerials and spins with it.
You really should start using the ceter hole above he handle for more tricks.
I play tennis and do this all the time too! I try not to use my good racket though, in fear of damaging it.