Disney's Family Fun has a cute idea for valentines made from yarn. Your kids will love getting messy the yarn. All you need is some cornstarch glue, yarn and a heart shaped cookie cutter.
Good for ages 2 and up.
Get the instructions here:
http://familyfun.go.com/crafts/sticky-hands-warm-hearts-973682/
2 little hooligans winds valentine colored yarn onto a heart cutout.
Get the instructions here:
http://www.2littlehooligans.com/2011/02/02/this-morning-i-did-little-crafting-with/
Toddler approved shares one for the youngest set.
Get the instructions here:
http://www.toddlerapproved.com/2013/01/simple-yarn-valentine.html
C fabbri designs wraps wire hearts with yarn.
Get the instructions here:
http://cfabbridesigns.com/most-popular-projects/yarn-hearts/
We know stuff uses twine.
Get the instructionshere:
http://www.weknowstuff.us.com/2012/01/intertwined-hearts.html