My friend Jen made these last year and I printed out a bunch but never got around to using them until this year. Lady Valentine loved sorting the sweetheart candies, counting them, and then graphing the hearts. This activity became a nightly 'game' at dinner time - each night we opened a new box. I was also amazed at her memory because she would remember the day before's count and compare the amount!
The Valentine Pre-K pack I downloaded from Over the Big Moon was fantastic! The graphics were super cute and included lots of different activities that were just right with what she is doing at school.
Oh and the best part - it's FREE :) http://overthebigmoon.blogspot.com/2012/01/valentines-day-pre-k-pack.html