Need ideas for decorating a boys room with a dinosaur theme.?

Two of my sons ages 5 & 8 share a room, they love dinosaurs, reptiles etc. and want this as a theme for their bedroom. I have several ideas in mind for the bedding, but would like to as a touch to the walls. They are white now and the carpet is tan which is helpful. All of the bedding sets I am considering are good colors one is tan/beige with dinosaurs, one is burgundy, and one is blue. What can i do to the walls to add character and pull form the bedding. I am also still looking for unique bedding, I have tried Target and The Company Store, you can go on line ans see what I'm talking about. I want a room that is not toddler like as my 5 year old acts like my 8 year old.