Danish tradition: Weaved Heart Basket Patterns - Much more challenging but would look great on a tree. The cool thing about them, is you can staple a handle on them and then fill with treats and hang on Christmas tree.
Valentine bookmark craft kit from Kazsmom on Etsy. Looks like hearts laminated between two lamination sheets to me, with hole punched in the top for a ribbon. Could change up from hearts to Christmas trees, or Christmas star and such.
(image) What a great idea for the kids / grandkids! Perfect DIY project & recycle those used / broken crayon pieces, too. Would make for a great party favor, gift for Valentine's Day (or other occasions) or gift from Teacher to Students! Love it!