Here are some great resources you can use in your classroom.
This is a freebie that I drew years back to treat my lovely grade 9 students. Now I use it every year as a coloring contest. All contestants get a prize - usually a V-Day pencil and heart-shaped sharpener - and the winners get some bigger prizes. It's always a good time.
These Bingo games are super fun for V-Day. Fill the heart instead of the whole card and use conversation hearts instead of counters to be extra sweet. If your students have trouble with adding the coins, let them write the value on the page (use dry-erase markers if you've laminated your game cards) so they can do the math and then have more fun when you play.
Canadian Coin Bingo