Flower letters is a very simple and beautiful DIY project for a baby girl nursery. Buy fake flowers from the dollar store, letters from a crafts store (or just cut them out yourself) and glue the flowers onto the letter.
I like the idea of having a simple shelf above the head of my bed. This would work with the idea of the box lights instead of a headboard - they could hang down from the shelf! And that shelf could hold all of my most treasured books!