I used a digikit called Butterfly Kisses from Kreative by Karen and Craft Artist 2 to make my card. Over here in the UK we only send to our partner/husband/boyfriend/girlfriend/wife or someone we hope will become one of those! We follow the traditional association of the day as described in Wikipedia:-
The day was first associated with romantic love in the circle of Geoffrey Chaucer in the High Middle Ages, when the tradition of courtly love flourished. In 18th-century England, it evolved into an occasion in which lovers expressed their love for each other by presenting flowers, offering confectionery, and sending greeting cards (known as "valentines"). Valentine's Day symbols that are used today include the heart-shaped outline, doves, and the figure of the winged Cupid. Since the 19th century, handwritten valentines have given way to mass-produced greeting cards.