So DS is moving into his new room soon. Yay!

We aren't going to paint a feature wall like we did for the other two bedrooms for kids. So I want some other ways of jazzing up his walls. What can I do?

His bedding is all transport/car themed. MIL is looking for curtains in the same vein. I'd love some removable stickers in a similar theme. Which ones are good? Which ones work? Not too pricey?

What else could I do to his walls/floor?

Ideas please!