This is so simple and I can not believe I thought of it. (Well I'm pretending I did atleast)
All you will need is::
*Cake Mix(which usually calls for)
--1 cup water
--1/3 cup oil
-- 3 eggs
Blend ingredients together in a large bowl. Beat with a mixer on medium speed for 2 minutes or whisk by hand.
After that added a couple drops of green food coloring, enough to make it green-green. Take a knife and just swirl it around in the mix so it's not ALL green, just green swirls.
Excuse the muffin pan, please 
Bake approx 19-23 minutes. Poke a toothpick in the middle cupcake to see if it comes out clean. If so take them out. OUT!
Let them COOL!
I like to call them Grinch cupcakes..minus the Grinch.
Take 2 bowls and divide your frosting up -It should be white icing- add some red food coloring to one bowl and green to the other. Mix and ice the cupcakes.
Crush some candy canes and sprinkle on top.
--You've just entered Cupcake Land...--
****WARNING****
::Do not leave your cupcakes on a table that your fatty fat dog knows how to get up on top of while posting your fabulous cupcake blog in the Kitchen Goddess Suite, or this is what will happen::
Godzilla enters Cupcake Land. 
Thank goodness I have backup. 
These look sooooo sweet and delicious!
They look very yummy & so creative! I LOVE cupcakes...lol The other day, I invented my own little cupcake design too!
love it! 
These are SO cute!! They totally look like they are straight out of Whoville.