I had intended to use the inside lines as a guide for the red frosting. What actually ended up happening, was that I filled the entire space in with red frosting, then carefully peeled/removed the template before the frosting had set fully. It actually worked pretty well.
I had added cocoa powder to my frosting to darken it further. I failed to completely mix it though, which made it hard to squeeze the frosting out of the fine tip of my frosting applicator....so be sure all your ingredients are thoroughly combined!
Feel free to used fondant to decorate your cake too. That'd probably make the design much easier to create...we just don't care for the taste of it in our household.
For the chocolate cake or frosting recipe, see my post from his birthday last year in which I made him a Magic the Gathering cake.
Want more nerdy cake inspiration? How about a Lego man cake?
Have you ever made or received a nerd themed cake? Let me know in the comments!