Dressed for the occasion, these cards are great for dealing to friends en masse. Write the greetings on glassine envelopes with a no-smudge marker, or print them according to the following directions.
Using a word-processing program, type 4 messages; size each to fit onto a glassine envelope, and stagger them a few inches apart on the page. Print onto a sheet of 8 1/2-by-11-inch paper.
On the printout, center 1 envelope over each message. Using removable tape, affix the top and bottom edges of each envelope to printout.
Using the manual feed on your printer, insert envelope-taped printout, and reprint. Remove tape. Repeat steps 1 to 3 to make additional envelopes as needed.
Insert 1 playing card into each envelope, and seal with a heart sticker.