I love cards, and although in my country it is not custom to give cards on Valentine's day, I made some. This one I particularly like, it is easy to make:
Material is basic: paper, white glue, brown sugar, ribbon, candies, foil (or cardboard) for stencil, scissors
Make stencil - draw hart on foil and cut it. Cut the card from cardboard.
Put the stencil on the card where you want it, glue the shape with white glue, a little bit thicker.
Leave it a minute to dry and sprinkle with brown sugar.
Leave it about ten minutes to dry, carefuly remove the stencil and slowly shake off the excess.
If necessary, to better fix the sugar you can gently spray the sugar shape with glue spray (if you have it) or hair spray - try aside on a test stencil first.
Design a ribbon shape with your text - I made it using Microsoft Word (Insert tab -> Shapes) and just printed it on the plain paper.
Print ribbon shape, cut it and glue it on the card. Round the card corners if you like.
Punch two holes and slip the ribbon, tie candies. Card is ready!