I was going to suggest like cloud and moons like what @garay88 posted :)

I did dinosaurs theme. Green orange and light blue with dinosaur decorations through out

I don’t even have a theme. Just colors. 🤷🏻‍♀️ nature is always an easy one.

Circus
Where the wild things are
Toy story
Royal king

Pinterest has alot

Lion king
Monsters ink
Woodland creatures
Hunter deer
John deer trackers