Oh dear I'm now thinking this might be good (sorry I didn't seee your comment earlier Oliver)
OK here's an idea for a song the ecstastic bathtub may like to dance too.
In this 'Singing In The Rain' clip there is a section from 2:28 - 2:50 that I have looked at where Gene Kelly dances infront of a static camera. This shot (not just for ease) gives a nice little dance routeen that doesn't look contrived. It's so relaxed and happy that I think (and hope) it will work well in giving my bathtub some life. It's a challenge I know but it's better to put off a challenge than to just play it safe.