C.H.
Some things I've done in my class -
I give each child an unopened box of conversation hearts. We have them sort them into groups of 10 then add their extras to see how many were in each box. We use this info to make a class graph. Then the kids sort their hearts by color. We make bar graphs coloring the columns with the corresponding crayon. With older children we then had them choose 10 hearts and use them as part of a conversation with quotation marks etc. They had to glue the candies to the paper. It was a lot of fun, but the glue would sometimes eat away at the heart. In any case everyone would eat their manipulatives when they were finished.
Also playing valentines bingo with caring and kind words or with previous spelling words by covering them with candy hearts or cut out hearts.
We decorated valentine boxes to hold valentines
another thing which the kids got a charge out of was I talked about how valentines day wasn't just about candy it could be about "healthy" hearts. We did exercises to get our hearts healthy which they had fun doing!
That's all off top of my head!