They measure 3" wide and 4" tall. I've put two on one 4x6 and are having them printed at Costco. So for 7 cents each (well not including the candy) the kids will have cute, custom, Valentine's cards with almost no work.
I don't have a finished one yet, just sent them to print, but the idea is to put a mini chocolate bar at the back, fold over the top of the card so it covers the end of the candy wrapper and staple together. EASY AS PIE!
If you want a jpeg of either one of these cards, or both, email me at firstname.lastname@example.org. If I knew how to make a fancy downloadable link thingie for y'all, i would. But I'm pretty much illiterate when it comes to that stuff so email will have to do. UNLESS someone wants to send me a tutorial. That would be super cool :)