One fun boy's room idea is to decorate the room based on the child's favorite picture, Better Homes and Gardens suggests. Paint the walls in colors that contrast with the picture to create a unique look. Another fun idea is to decorate the room using a favorite interest or activity to create a specific theme in the room.
Integrate small details such as throw pillows, pictures and toys when decorating a boy's room using a favorite interest or activity to create a cohesive space. Including a large mural on one wall, notes Pottery Barn Kids, or a specially designed bed also helps to display the theme of the room. Some ideas include beds that are shaped like boats or cars.
Another idea is to decorate the room using a nature theme. Paint trees on the walls or use tree-covered wallpaper and use a variety of wood finishes on the room's trim and furniture to create an outdoor feel.
Another way to create a themed room is to keep the decorations in the room basic while adding small touches to augment the space. This type of decorating allows items to be replaced easily as the child's interests change. For older children, integrate a loft design into the room by using a bunk bed placed above an open area containing bookshelves, a media center and storage space.