I promised my friend, SIG to show her the step-by-step pictures guide the next time I made the zebra cake, so here it is girl friend.
Two different colors batter.
First, put a dollop of white batter in the center of the pan.
Next, put a little dark batter on top of the white batter.
Then, you add another dollop of white batter on top of the dark batter.
Again, add another layer of dark batter on top. Just keep alternate different color of batter on top of each other until all batters are used.
I didn't do a great job on this as it was not center.
Example of how it would look like when baked and cut. Good Luck!
Recipe of this marbled banana chocolate cake can be found here.