I have made those without the top pretzel and adding an M&M onto the top. (You put it on after you take it out of the oven when the Hershey's kiss is a little melted). It resembles an eyeball just enough to make it a good Halloween treat, especially if you use Halloween colored M&M's.

The first time I made these, I melted the kisses under a broiler a little too long. They end up getting hard, not melting all over the place like you would think. You only need to put them in for a very short while - maybe a minute.