You know, I couldn't help but speculate about how this scene would have gone had it happened to any of the other designers:

Laurie breaks the piano: Shrieks. Looks horrified. Breaks into more pieces than the piano.
Frank breaks the piano: Chops it up into little pieces and applies them all over a coffee table like a mosaic. Uses surplus for an incomprehensibly ugly piece of wall art, along with some Styrofoam packing peanuts and a Ziploc bag.
Doug breaks the piano: Builds a big façade around it. Hangs portrait of his feet on the façade. Is peeved by the lack of enthusiasm for his approach.
Gen breaks the piano: Giggles. Jiggles. Giggles some more. Blames Ty. Giggles. Uses the wreckage as inspiration for her next room.
Kia breaks the piano: Turns it into a fountain and makes it the centrepiece of the room. Is inordinately pleased with herself.
Edward breaks the piano: Like he'd ever have the chance, given how little he's on the show.
Vern breaks the piano: Only slightly more likely than me marrying Donald Rumsfeld, but if it did happen, would just build them a better piano. With additional storage.