If you want to make cool boy rooms, you must consider some things here. First you need to check the bed. Bed in cool boy will not be made with classic design. You just need to put simple bed or sofa bed. You can also use army bunk bed to make cool boy bedroom. Second, you should not use warm colors such as orange, red, and pink for your boy room. You can use some other colors such as gray, black, white, beige and some other colors. Third, you can add carpet flooring and unique shelving design in the room. It is good to add bookshelf or storage space under the bed.