I love Vistaprint - they have such great items.  They have a ton of templates for Valentine's Day cards for the kids to send out.  And what is even better is that you can customize the front and back of each one. You can even include your own photos! There are 3 to a sheet and each of the 3 is different.  So you will have 30 cards in all, 10 of each design.  Right now they are offering these for FREE, just pay shipping ($4.82).  Click HERE to get started.  My favorite is the sock monkey :)