I love this idea. An envelope guest book. You just take a store-bought scrapbook/album and glue envelopes into it. Lay out colored pieces of paper for guests to jot notes down on, and then they can place them in the envelopes.
This is the color scheme and the bouquet I have been looking for. This would be great to do for when that special day comes. Silk Flower Wedding Bouquet - Tiffany Blue Calla Lilies Natural Touch with Crystals Silk Bridal Bouquet