For children’s rooms, regular wall shelves are often the cheapest option and, in most cases, will do the job just fine. But if you want something a bit more decorative or funky there are other options at hand…

A pair of pastel pink wooden shelves suspended from white rope fixings.
W56 × D13 × H60 cm
from vertbaudet.co.uk

A single wooden shelf suspended from a rope with tassels. Available in 6 colours.
Shelf measures: W38 × D14 × H23 cm
Available from amazon.co.uk