I am making a Monster High Doll cake for my daughter and want to get the marble effect with the batter. What is the best way to do this?

this is the method I use http://www.mycakeschool.com/blog/how-to-make-a-cake-with-zebra-stripes-on-the-inside/

Thank you so much and that does make since...However in my way of thinking today I put have of the electric pink and then piped in the electric blue, going in circles every so often. Then I drug a toothpick through it.  I hope it turns out.

I'm sure it will look great.

thank you