This is so cute and simple, environmentally friendly and really gets the kids excited.  Get a small ziploc bag and fill it with birdseed, sunflower seeds and a tiny bit of glitter.  Shake the bag up and let everything mix together.  Cut a small square out of construction paper in color of choice and then paste a smaller square on top of that one.  You can write Reindeer food on it, or a poem or whatever you like. Then you simply staple it to the ziploc bag or paste it. This is what ours says: Sprinkle on the lawn at night, the moon will make it sprinkle bright, Santa's reindeer fly and roam, This will guide them to your home. 

My daughter will be 3 this month and is so excited about Christmas this year.  Not only do we get to leave Santa cookies and milk, we get to sprinkle "reindeer food" outside of the patio.  This is great because she asked me why we do not have a chimney and this explains how he can find our house without looking for a chimney.