Your idea books are overall very neutral. Are you looking to add color to your bedroom or stick to neutrals? Here are some neutral ideas:

During the months that are warm enough, put some pretty pots of plants, probably shade loving, outside your window.

I would use a cream color on the walls to brighten up the room. Do you have any lighting in there?
A plant that does well in there would be nice..something like a peace Lilly or a snake plant.

If you are going to stay with the natural look, you should come check out the Live Good page when you are ready to chose your bedding

Live Good Sheets and Duvets

For one room in the basement, we have recess lights and a centered flush mount light. It depends on how much light you need. If just ambient light, then you could do just a light in the middle and then lamps for the bed area