Shared boy bedroom colour suggestions

Breanna • 23 year old mommy to Jace(08•20•13)+Matthias(10•23•18) wife(06•03•16) baby #2 made through IUI and donor sperm.

My 5yo and newborn will be sharing a room, right now the walls are plain white but I want to paint and do some what of a nursery but have it in a colour for the 5yo as well so he doesnt feel as though the baby is taking over! Drop pictures below if you have a similar situation or just some suggestions!