Add marshmallows to melted butter, stirring to coat. Melt in microwave at 30 second intervals, stirring until melted.
Stir in green coloring and vanilla.
Add corn flakes and mix. Put spoonful of cornflakes on wax paper. Allow to cool for 5 minutes.
Form into the shape of a wreaths. Add red candy piece on top of each for decoration, if desired.