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.
"Use a white light switch cover and decorate your own with sharpies!" Look, I tried decorating something with horizontal Sharpie patterns and it did NOT look like this. Also, do you really want to buy all those colored Sharpies? give your room color.