Rainbow "Sparkle" Birthday Cake

So for Claire's 3rd birthday, she told me that she wanted a rainbow and sparkles birthday party and for her other party (We are having two, to accommodate family visiting) She stated she would like a dancing garbage man birthday as well. So we'll see how that one goes.
Back to the rainbow and sparkles cake. Now, normally I would have made everything homemade. But I never made a homemade vanilla cake before and felt nervous about screwing it up, as I wouldn't have been able to go out and buy more supplies since we had the winter storm of a life time this weekend.

So ingredients are as follows.
-1 box of white or vanilla cake mix (I used Betty Crocker)
------>I used 3 eggs, 1 cup of water and apple sauce. 1/2 cup I think, Instead of oil.You can do what you feel comfortable with. The apple sauce measures cup for cup. I liked the idea of saving some calories and not noticing a difference in taste or texture.
-1 box of instant vanilla pudding
-Wilton gel food coloring. I used 4 colors. Red, blue, purple and green. Remember a little goes a long way!
-Kit Kat bars. Lots of them. I bought 1 bag, and that will most likely work. But you cant eat any, or there will be holes in your "fence" ...That was a little problem over here...Ooops!
-M&M's
-Vanilla frosting (I prefer to make my own, but was out of  powder sugar, so store bought it was.

PLUS:
- A pretty ribbon to tie around your cake (Optional, but adds a little "extra" to it.)
-I had a card board cake bottom. You could also use a cake stand or plate.

Start out with your pan. I used two 8inch round pans and sprayed them with Crisco no stick cooking spray. Set them aside.

-Take a large mixing bowl, pour in the cake mix, vanilla pudding powder and the ingredients you need from the back of the cake box. (Eggs, water, etc...)
-Take 4 large wide mouth cups and divide up the batter by fourths into the cups.
-Put in 1 color of gel food coloring in each cup (One color for each cup) Start with a tiny bit and add more as you need it to get the color you desire.
-Glop in big spoonfuls around the cake pan (Make sure you already greased your pan!) Its kind of like Tie dye, you cant really screw it up.
- The take a butter knife, place inside the pan and move it up and down like you are making ocean waves. Don't do too much, it will come out looking gross and brown. A little goes a long way with the swirling technique.
-Bake in the oven according to your cake box directions. Mine was at 350 for about 18 minutes. I take my cakes out AS SOON AS THEY ARE FIRM AND HAVE NO MOVEMENT WHEN THE PAN IS LIGHTLY TAPPED. Let the cakes cool.

Ok, so your cake is baked and COOLED.

-Place your cooled bottom cake on the cardboard cake bottom, cake stand, or plate. You might need to cut some cake off the top, just do it nice and straight.
-Frost that top.
-Then place the second layer on top and you might need to cut a little off the top here as well. Just nice and straight. Frost the top and the sides of the 2 layer cake.
-Place the Kit Kat bars around the cake as though it was a fence.
-Pour or place M&M's on top of the cake. I used about a half of a medium sized bag. I was glad there was some left over for me to snack on!
-Measure out your ribbon and cut to desired length. Tie your bow.
-VOILA!

You just made a fantastic Kitkat rainbow cake.

Here is how mine came out. AND since I made mine with Apple sauce, its more "healthy" then it could have been :)