In my mom's bookshelf with children's books is this really nice book by Danish-Swedish Poul Ströyer from 1960. "Sket er Sket" is about a little boy, Kalle Kæk, who exchanges his little dog for a cat for a lollipop for an anchor for a crown for an excavator for... and ends up with his little dog again at the end of the day. "Done is done" is the motto. I remember the book from my childhood, and I love reading it for Frida Viola.
Here is another book with nice illustrations by Poul Ströyer that is on my wishlist.