DH and I obviously help our primary aged children with appropriate gifts for birthdays, Christmas. But they like to do their own thing too.
Last birthday, I opened an "extra" gift from 6yo DD2. It appeared to be a scrap of blue latex. Closer inspection showed it was the tied-off end of a defunct balloon.
She was absolutely swelling with pride - "I got you a balloon, but this way, you don't need to worry about it bursting and making you jump!"
Very thoughtful in its way. What are your best random child offerings?