I was asked a similar question by a Vassar student about 1990. One development was this: conductive rubber mats used to prevent static from damaging sensitive electronic components were set up as control voltage generators for old-fashioned synth modules. The mats served essentially as potentiometers with a DC voltage brought to one end, zero volts to the other, and dancers feet as the pickups for voltage sent to modules.
These days I'm sure you could do a whole lot more with computer synthesis, say using a video image, picking a few pixel points on that image, interpreting pixel's brightness/color as control elements for "virtual" synth modules, for pitch, loudness, modulation etc. Movement to trigger sound? Program each sound module to remain silent unless there is a change in condition of the controlling pixel.
I'm sure more ideas will follow, stay tuned! And welcome aboard!