Some bridal shower card sayings are: "Hope your shower and the days ahead are filled with sweet, happy moments. Best wishes always." Another to consider is: "The sweetest gifts aren't the ones on your registry. It's the happiness and love being wished for you today. Happy Shower."
In addition, some very popular bridal shower card sayings are directed to both the bride and the groom, such as, "Warmest wishes to both of you for a wonderful wedding day and a bright and happy future together." For a sentimental touch, try, "A wish from the heart that you'll always stay as happy as you are today." For a nice word play on the "shower" aspect of the event, use, "Showering you with wishes today for the happiest kind of tomorrows. Congratulations and much happiness to you always."
When sending a special card to a bride-to-be, one may wish to take a more memorable route and consider personalizing a card with a special, hand-written message. For example, the message can include the bride's name or nickname, as in, "You're a special bride-to-be, Katherine. And this is a wonderful time in your life. May it be just the beginning of a lifetime of dreams coming true."