I have no before shots of the guest bedroom (it was an afterthought that I would do this room) but basically it was very plain white walls, with one blue wall.
The walls are now painted the same colour as the downstairs and hall, stairs and landing. I got the same carpet everywhere as well.
And then the major change I switched the cast iron bed room from the master bedroom to this room.
The new bed linen and curtains are from IKEA(!!!) of course!