I don't plan to do any redecorating in his room, for years to come (that's my plan at least). The only thing I anticipate changing is when it comes time to convert his crib to toddler bed, then to a full size bed.
I think the decor I did in his room- airplane theme, although not dramatic; neutral colors, and furniture he can grow with, will fit in his room for the next 18 years at least

. If he wants to change the style later on, then that's another thing.