need creative advice for my daughters school tomorrow pls

[Ley]

My daughter's class have started this musical circles thing this term. Every wednesday at 3 they are having special musical circles where the kids all play instruments they have made themselves from stuff found in different rooms of the house. I only found out today as Abigail had been off sick last week and I have to try and come up with a musical instrument made with things out of the bathroom by tomorrow.
My first thought was the obvious - toilet roll holder with bath salts inside and make a shaker.
But I got the impression that every mum was doing this too and I really want Abigail to have something original and something that seems like we made an effort if you know what I mean.

Does anyone have any ideas?

 

[freckleonear]

Empty bottles taped side by side and filled with different amounts of water, blow across the top of each bottle like a flute.

Strong cardboard box with a round hole cut in one side and elastic bands stretched across like a guitar.