For my five year old son's room, I sewed circus flags or bunting for his window. His room is a light yellow, then his window well and corresponding wall is the darker yellow. The window forms this little nook/ cut out from the rest of his rectangle room. Anyway I thought circus flags would be a fun thing for the room to make it juvenile without making it babish or girly. If you have a beef with the material bring it up with the 5 year old, he picked out the fat quarters himself. I bet you would never guess his favorite color is yellow.
Then while we were at Jo-Ann's getting interfacing, he saw a mini quilt on display. He wanted to buy it, so I made him one with left over material from the flags.