The Caterpillar brand is easily distinguishable by its dominant hues, yellow and black. Make these two colors dominant in your bedroom as well, painting one wall a dark black and the others yellow to reflect the hues without making the room appear too dark and gloomy. Carry these colors down to the floor by procuring a black or yellow rug for the floor.
The sleek metal that makes up Caterpillar tractors is cool and glossy. Give a nod to this by choosing metal furnishings over wood. Select metal bedside tables in glossy black or yellow. Instead of a standard dresser, purchase a metal tool-shop work bench filled with drawers and paint it to fit with this color pallet. When selecting a bed, choose a metal-framed one to keep this cool, metallic theme going.
The impossibly large wheels that rest at the base of caterpillar tractors are one of the things that make them so imposing. Reflect this dominant feature by adding in accents featuring large commercial wheels. Seek a lamp craft to look like a monster-truck wheel. If you are craft-oriented, purchase an old tire, clean it up a bit, then transform it into a seat by filling the center with beanbags or pillows to make it a cozy reading spot.
Let your room inhabitant help you create wall decor for the room by printing out tractor coloring pages and allowing him to color them, then framing them and placing them on the wall. If you are handy with a camera, venture out to a site where Caterpillar tractors are at work and snap your own shots of them moving earth, blowing them up and framing them as custom wall art.
Make one wall in your space more engaging than the rest by having a construction scene painted on it. Commission a mural featuring Caterpillar tractors at work or paint it yourself if you have an artistic flair. With this unexpected finishing touch, there will be no mistaking the theme that you are reflecting in your bedroom space.