The annual Polypad Art Contest is worth browsing through: https://polypad.amplify.com/contest

From last year, this Moonlight Sonata in the 12-15 year old category is awesome: https://polypad.amplify.com/p/3VOW6BLM7AYqhQ

And I'm partial to this creation by an educator: https://polypad.amplify.com/p/hPjJZ4DC2Tpywg

but they're all great

(disclaimer: i am CTO of Amplify)