one option would be to make it out of fondant or gumpaste. i made a buffalo sabers design by printing out multiple copies of the design, then using my exacto knife cutting out the parts that were different colors and using them as a template for colored fondant. then i just layered and assembled it.
but you could also use a fbct or chocolate.
I've made batman and superman this way.... I didn't even print it out bc my printer isn't working... so I blew it up on my screen to the size I wanted and traced it on paper then cut it out with exacto knife and then lay that over my fondant and cut it out.... voila!
I just made this type of cake this weekend and I drew the Superman Sign on a piece of cardboard. Luckly I can draw lol. Then I used the cardboard to trace over yellow fondant and the same for the "S" on red fondant then layered them on top of each other. Heres a link so you can see my cake.
I did the entire Superman last year that was a FBCT. Turned out really good except I am too hard headed to listed when they said to use a mirrored image! Afterwards I looked at it & had that 'ohhhh.... i see' moment! Oh well, good luck!