Minimalist Kids Bedroom

We need just small space to create our kid's bedroom, but ideally, rooms would be cool funky (so the kids like them), good quality and affordable (so you like them), and preferably keeping with the style of decorating in rest of the house (so they don't look like a preteen tackatorium).
Children doesn't like to had a large bedroom, they were more likely to play in outdoor room, so, if we had just a small unused space, we can use it for creating children bedroom. This picture is taken from www.hgtv.ca, see another room design there!