Kids bedroom ideas?

I am moving in a week or so. I’m ready to put my 1 year old in the same room as my 4 year old. He sleeps through the night most nights. My older kid knows not too mess with his brother. I’m going to keep a pack n play ready in my room Incase the adjustments not easy.

Can I get some decorating idea and organization tips! The babies side is going to be lion king and the older kids is going to be PJ Mask!

Thank you!!!