DIY Scratch-Off Valentine Cards - This would be great for all kinds of ideas... Print design on card stock. Write in message; when dry, color "message" area completely with white crayon. Liberally paint over colored area with a 2 to 1 ratio of dish soap and acrylic paint (though thick & probably bumpy, this WILL dry perfectly smooth). Let dry completely (will take at least an hour).
An adorable gift idea that lets you say exactly why you love them. Author your own personalized book of love reasons. Each pages lists a different reason and is illustrated with your characters. Guaranteed laughter and tears.
Write on background in braille, repeated, happy (all as one "word" or spaced, not sure)...then at the end, on a dymo tape tag, "birthday". Could paper-piece a doll/etc on top. Same with Merry Christmas and tree.