Here's your origami sheet. (Notice "love" becomes "note" when flipped upside down? Crafty. But don't worry if all you have is a plain sheet of paper. Design it yourself!)
Flip the origami over so that the inside of the note is facing up. Fold in half so the lower point touches the upper point.
Fold the left side in one-third of the way.
Fold the right side in one-third of the way.
Fold the top flap (the one you just folded over) to the right at the halfway point.
Crease the flap you just folded diagonally. Unfold.
Slip your finger between the layers of the top flap. Pinch the point indicated by the circle and bring it up to the arrow, squashing as you go, to form a diamond.
See the diamond?
To close the love note, tuck top corner into the opening of the seal.
This pattern is excerpted with permission from <a href="http://www.amazon.com/gp/product/0823092380/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=0823092380&linkCode=as2&tag=craftfocom-20">Girligami: A Fresh, Fun, Fashionable Spin On Origami</a> by Cindy Ng.