Boy nursery ideas

Julie • Full time mommy to 2 amazing little boys. A 3 year old and a baby born March 16th 2016 🍀
If his baby is definitely a boy, I would like for his color to be orange. We did green for our first son. Car seat, stroller, first outfit, nursery walls, I like to do one color. 
However I can't come up with a theme that I like for orange... With green we did monkeys and Palm trees.
Looking for orange suggestions. Please and thank you