One of my first footmic-based sound system designs, The Odd Couple was a good experiment in what I was able to accomplish within a transparent sound design. The theater, while not huge, needed some reinforcement, especially towards the back of the house. I had footmics along the front edge of the stage, as well as hidden behind sofas and on the poker table.
There were many scene changes that needed music to cover them, so BT, the director, carefully staged the transitions and then asked for specifically-timed transition cues of period music. We ended up mostly using Henry Mancini music, and each piece I chose needed to be edited to an exact length (22 seconds, for example) while still containing a big initial event (to button the scene previous) a middle section of swinging jazz to cover the transition, and then a build to a finale (to button the energy into the new scene.) BT was very specific about what worked for him and what wasn't quite right, so there were many tweaks to each transition cue!