I'm painting my room (it used to be an attic and has paneling walls)?

I know the color's I'm going it paint my room. The two walls with the windows (on each side of the room) are going to be lime green, and then the other two walls are going to be a purple color. On the purple wall that my bed will be on, I am splatter painting it with the lime green. I have a stairway in my room, and we have no idea what color we should paint the inside of it (with the stairs) or what color to paint the side of the stairway facing my room. I NEED ADVICE!