I can take no credit for this idea, but you can bet I'll be using in the very near future. It's super cute, you don't have to be real neat or detailed and it can be varied for any holiday.
To get this simple but clever look, just slice off the top of a cupcake. Using a small cookie cutter, cut out a small design from the sliced off top. Put down a layer of icing on the cupcake then replace the sliced off top back on the cupcake over the icing. In the picture above, they also added more icing inside the heart after it was replaced by using a pastry bag (which is an upcoming post...don't fret) or a simple ziploc bag with a corner snipped off.
Now, you've got a few options of what to do with the part you cut out. You could eat it! Or another simple idea is to just ice a cupcake the old fashioned way and put the cut out piece on top as a sort of garnish.