Martina Moliis-Mellberg wrote about Elliot, who just cannot stop rhyming! Together with their big sister, they walk home from school and stumble upon all sorts of city scenes inspiring more and more rhymes. 
The book is published in finnish by S&S, translated by Henriikka Tavi.
Pieni runomieli – shop finnish edition here!
I mitt lilla huvud – shop swedish book here!