I like the way the window trim is integrated with the wainscoting on this one.

I can easily picture this one below as a bedroom.

Here’s another beautiful room from Studio McGee.

Would you do one wall or entire room?

I think I would need to see the room and the furniture layout. If it’s a small room, I would probably do just a feature wall behind the bed.

squares or vertical shiplap? Which in a bedroom?

I like the beadboard in the last photo.

Suggesting wainscoting would be behind the bed, not around the room.

Really appreciate you taking time to respond

last question.... should I use a traditional 1x4 or MDF 11/16 x 3.5"