I love putting unique skills in my routines, they just make people look, and they'll remember you for it. I don't have any for floor or vault, but some for beam and bars.
beam: If you start with your dominant leg horizontal in front of you, and keep that leg in that spot the whole skill (have someone hold your foot there at first if you need) and just turn half way around into a scale.
Bars: straddle like your doing a kip, but lean backwards so your toes go past the bar. Then, with your legs still in a straddle, push off the bar, snap your legs into a pike, and grab the bar again.