Future Child's Room

I love designing rooms as you can probably tell. Well I have done most of the rooms in the house so far and I wanted to design a room for our future child. I have been loving the yellow and gray color scheme and wanted to try a room that I could use it in.  I have always wanted a very neutral color scheme for our child's room but I am really starting to love all the colors I am seeing used.

On here is the color for the walls, which is a can of Behr paint but you can barely see the gray color for some reason.. I have tried to fix it a couple of times, but it wouldn't work for me.