Here are a bunch of ideas for Valentine's Day Decorating. I found them on the tipnut site, which has a Valentines page.
Valentine's day barrettes- made with felt hearts for little girl's hair.
Valentines Snowflakes- made from coffee filters and patterned paper.
Valentines Garland- no sew fabric hearts
Danish Woven Hearts- no sew woven hearts that can be filled with little candies.
Felt Conversation Hearts- felt version of the classic candies.
Scrabble for you!- cute if your into scrabble.
Heart Mice- nice paper project using heart shapes.
Valentine Chair Bags- backpacks for the chairs, fill with treats for Valentine's Day.