Melt the green candy melts according to package directions. You can use a microwave or a double boiler.

Dip each Rice Krispie treat into the melted green candy melts, ensuring it's fully coated. Let any excess drip off.

Place the coated treats on a parchment-lined baking sheet. While the candy coating is still wet, press two candy eyeballs onto the top of each treat for the eyes.

Use the black decorating icing to draw a mouth below the eyes on each treat. You can also add a few stitches for effect.

Press a few mini chocolate chips into the green coating below the mouth to create Frankenstein's bolts.

Allow the candy coating to harden completely. This can be done at room temperature or by placing the treats in the refrigerator for a few minutes.