I can't remember who, but someone on this site made adorable Spiderman rice crispy treats. They are on the user's photo screen. I will look and see if I can find it. I believe they tinted the marshmellow red, and then decorated with icing for the web and other details. They looked great! I was thinking about trying that myself. You could always use those icing writers...or if you didn't want the icing to be able to smear at all, you could use the CK brand candy writers. They come in a bunch of colors and then I wouldn't think the decorations could smudge. They are excellent for small details.