Pastels are basically a staple for French decor along with patterns and wood accented furniture. Rather than covering your walls with a toile or rose laden wallpaper, consider painting them pastel blue instead. Suddenly all the blues in the room will feel tied together and more styled than you ever thought it could be.
If possible, surround your living areas with windows, or even floor-to-ceiling long transparent glass French doors to absorb as much daylight as possible. The overall interior design of the house is at a great extent depending upon the subtle game between the lightning, the settle walls and the elements of furniture.