Here are some fun treats I made for my daughter's preschool class last year. I got the idea from Family Fun magazine.
The magazine showed the same snacks on both sides of the snack bag, but I took the opportunity to provide a salty snack on one side (Goldfish) and a sweet snack on the other side (S'mores Goldfish). I also used strips of paper for the antennae and just used a Sharpie to decorate the clothes pin. I glued on googly eyes and that was it!
I suppose you could use Valentine's M&M's or other pink and red candies for Valentine's treats. Decorate the clothespin with hearts. I think that would be very cute!