Diy Beach Wedding Centerpiece Ideas . The varying sizes makes for a fabulous visual display and the uniformity of each set helps give the arrangement a clean look. Add a personalized note and voila! Blue DIY Wedding Centerpieces for Your Under the Sea Beach Wedding from www.pinterest.com It’s the perfect diy beach wedding (or bridal shower) decor that i could keep as a memento of the special day to use for decorating my home or cottage. Bring the sand to your tables. Shells, stones, pebbles, gems, crystals, moss or other naturalistic pieces are great theme accents.