Not strictly designed for children, but these 1960s La Mela and La Pera screenprints by Enzo Mari for Danese Milano would look amazing as feature artwork in a kids room.
Both of the images date from 1963, with the bold simplicity hardly ageing a day since. In fact, they’ve perhaps never been more appropriate in an of plain walls and minimalism.
The prints are sized at H1120 x W1120mm and come rolled in a poster tube with black plastic guides which attach to the print, to allow it to be wall hung. Each sells for £220.