Built a box, painted their last initial and wedding date on it. They put in their vows and two unread love letters to each other about why they fell in love, a nice bottle of wine from the year they started dating, and nailed the lid on the box. They promised that if things ever got too hard and their love started to fade, they will open the box, drink the wine, and read their vows and the letters they wrote to remind them of how much their love means and to never give up. Cute idea.
Give your bridesmaids planner with all of the important wedding dates in them: when to order their dress, bridal shower, rehearsal, etc. Also put in each other's contact info and all the locations to events. Pretty smart.