How should I decorate my sons room?

In the process of moving to our first home. My son is 6 and I want to paint and decorate his room…I have asked him what he wants his room like and he keeps saying I don’t know or gives multi themed room ideas (Dino’s and cars, and monsters). Would you guys be up for showing me your kiddos rooms? I’m trying to think of something he won’t outgrow in 6 months…

I don’t have boys but OMG I had so much fun decorating my daughter’s room.
You can do Monster tricks and Dinos together.
My suggestion is to pick a neutral color for the walls that match with everything.