Co-Ed Room Ideas

Demi💋 • Jerseygyal | Mom of two kings 👸🏽
My son is 4 years old and I'm due in September for my second. I'm praying it's a girl and am looking into shared room ideas. My biggest dilemma is color schemes. The accent wall in the room is already dark gray. I'm stuck btwn teal/gray, yellow/gray, or soft lime/gray. Any suggestions?