In order to create a room designed to your specific needs, you should start by recognising the very basic function this room is going to have. Wheather it is a nursery, combined with the bedroom, child's room which transforms to a place fit for a teenager, maybe even two kids sharing the same space, a small bedroom with included wardrobe space or a multi purpouse living room with a wide span of functional areas from dining to sitting and relaxing, watching TV, playing with kids, including a small home office, fireplace or multimedia.

Make a concept, build a list from which you can take out or add new features.

Changing the colour scheme and decoration will do sometimes, but if you need some functional transformations, there is a lot more to it and it should allways be carefully designed.