Usually, it'd be the fireplace wall that gets the feature colour. But you also need to consider how that will impact on the visual perception of the space. Also, have you asked your son's opinion? At 11 he is likely to have ideas of what he'd like in his room.

ignore the mess!!! These are taken from lounge door the window on the right wallthis is taken from window wall. The tv etc are not staying there!!! the archway leads into the kitchen, which is also in the process of being redesigned. There us a radiator in the wall under the window and behind the unit on the arch wall

The client was unsure what to do with this plain wall. He considered hanging art work but instead decided to turn the wall into a piece of art! The microcement compliments the kitchen units already fitted and brings the whole room together.

Hi, I would paint the entire wall.