Paint the room in Thomas' prominent colors: blue, gray and black or hang wall paper with a Thomas design or pattern.
Purchase a Thomas the Tank Engine bed. While this is an expensive purchase, it will give the Thomas fan in your home a thrill to crawl into bed every night, as he'll feel like he's jetting off to exotic places. If you can afford such a bed, outfit your child's bed with linens in Thomas the Tank Engine colors: red, blue, black and gray.
Buy Thomas the Tank Engine vinyl wall decals. These wall decals allow you to create instant murals of Thomas jetting down the tracks, his smiling face or some of the more memorable adventures with his friends.
Shop for a throw rug in the shape of a tank engine and curtains will small tank engines dotting them. If you can't find such items, purchase them simply in the red, blue, gray and black colors of Thomas.
Install a real working Thomas the Tank Engine train set around the center of the room. Hang a framed picture of Reverend W. Awdry and his son in the room, as there would be no Thomas if not for this man.
Assemble all your Thomas the Tank Engine books and accessories on a prominent bookshelf for all to see.