Here are some Cinco de Mayo images.... it may give you some idea about color combos. http://www.bing.com/images/search?q=...lors&FORM=IGRE
I am guessing you would need to use bold red, green, and white. Maybe make all spikes one color and the bow another color with a surround another color? If you mix them up too much then it will look a little Christmasy.