I made the postcard-size invitations on the computer and added clipart in each corner (of hula girls, a palm tree/sunset, a hibiscus flower and a conch shell). I then had the invitations laminated, placed each one in a sandwich-size ziploc bag (I double-bagged for protection) and added a small amount of water colored with blue food coloring, and three or four shells. (For those invitations sent through the mail, I included only the card without the water or shells).