Fogbank wrote:
top half of the wall one color and the bottom half another. what would
be the height of the lower color from the floor? 9 foot ceilings.

thanks

Depends. Personal taste, size of room, light, colors and patterns used,
placement of windows/doors, room use, floor covering, view of/from
adjoining rooms, etc. When I installed a chair rail, I put it at the
level where chair backs would touch the wall, about 30".

Let us know a bit more about the room.