I won't even bother putting the whole rice krispie treat recipe on here since you can find it on every box of Rice Krispies, not to mention most marshmallow packages.
Here's how to "dress them up." First, cut up some red and green maraschino cherries into quarters. I found the green ones at Target.
Once the treats have cooled completely, cut them up so that the cherries are at the center of each piece. Immediately store them in an airtight container if you don't want them to dry out. I've also found that using a little more butter and marshmallow than the recipe actually requires also helps keep them moist.
If you want to dress up your presentation of the treats, use muffin cup liners like I did in the photo above. Enjoy!