Finger dancing, where your index and middle fingers mimic legs. It's pretty funny if it's done well.
But you can also have hand dancing, where your fingers move in time to the music.
Having a song where there are different instruments that play each once at a time, and while that's happening you're moving a different part of the body to each part (eg head to one part/instrument, arms to another part/instrument, legs to another part/instrument), and then the song has the instruments come together and you combine all the different movements at the same time. I think it could make a big effect.
When you're practicing a dance to a song, slow down the song to maybe half speed and practice that way. Then speed up the song. It's just like practicing the piano.

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