All my gymmie has at home is a practice beam(sits about 3" off the floor) that we got for her when she was on pre-team and she's now L8. At home practice of acro skills and bars can be dangerous. Also after a little while if your kids are in a team program, they're in the gym so much, they don't want to do anything at home or their skills have outgrown the equipment you have and it ends up gathering dust.
If they want to do some practice at home, doing handstands, splits and some basic conditioning are all good and fairly safe.