Here is a Batman Birthday Cake Design I made for my nephew’s 4th birthday. I used a bat template I found online to carve the logo out of fondant. I used oval shaped cake pans (both were a single layer of cake), and covered the bottom of the cake in yellow marshmallow fondant and the top in black marshmallow fondant. I then traced and carved out an oval out of yellow fondant and placed the black bat cutout on top to make the batman logo.
The complete logo was then placed on the top of cake and smoothed out. I added a border around both layers with black gel (although I wish I would have used actual frosting for the border).
It was a really easy cake to make, and was a really big hit!