I guess babu's breath and sunflowers do look good together! Ceremony: aisle decorations - mason jars with twine loops to hang on shepherd's hooks - don't like the sunflowers, I would do all baby's breath.
Write you names and wedding date on a wood heart and frame it. Have your guests sign smaller hearts and drop them via a small slot on the top. What a cute and unique guest book idea that you can display after your wedding.