Do you mean true board and batten, which is usually an exterior treatment? Board and batten is wide vertical boards with the seams covered by narrow battens. This may be why your googling failed. What you are thinking of is more likely wainscotting (flat panel with stiles). It would look best on all walls in the room, and can be tricky to layout around windows and doors. Are the rooms fairly simple? I personally think it's difficult to make wainscotting look good in a room with a lot of furniture against the walls. It also makes furniture placement and balance more difficult. I like it better in a dining room or hallway,or a simple, colonial living room with little furniture. You may find that your three rooms look very plain now, but once you furnish them they will look fine. Masculine or feminine? Either one, depending on the style and the colors.

I'm glad you changed your mind about the SW blue if that's the sample on the wall--Too dark and unnatural imo. Are you staging for sale? Then I'd go for a less obtrusive color; maybe a very pale grey or off white, even just white for that matter.

@decoenthusiaste Thanks so much for your input, I am leaning on agreeing with you at this point as I really don't want the room to appear any smaller than it is. @Cheryl Smith You are correct, the entry door is opposite the knee-wall door, but that run of wall before the dormer is not long enough for the bed, night stands and to still have access to the closet. After a lot of thought, the bed fits best and makes the most sense against the far wall with the window. @njmomma Thanks so much for the pictures, I had never thought about a blue door previously, but I kind of really like it!

Can we see the room and your reason for choosing that color.