A small child may feel lost in a large bedroom, in order to make it more intimate for your son there are several things you can do. Wallpaper borders are inexpensive and easily changed as your child's taste vary. One reason we paint ceilings white is to visually lift the dimensions of the space so it will seem taller. A darker ceiling will make the height of the room seem lower and the room will be much more child friendly. You could paint the ceiling in a navy blue, rich taupe, or any color that your child loves.
Warm colors are usually much more comforting than cool colors.
Add cubbyholes for him to store belongings in and possibly help him to make a small fort or playhouse that will fit in the corner of his new room, as an option for his own special play area. Access to a three-prong electrical outlet for the computer. Access to a telephone connection will enable your children to do research for their school work on the Internet. If there is a window nearby, you may need to position the desk so that it doesn't create a glare on the monitor screen. I have purchased some second-hand furniture that I would like to use in my 9 year old daughters room.