I had a FF cake for my 16th too! (they don't call it "sweet 16" for nothing)
Mine had the pic of Yuna and Lenne back-to-back (you know the one), the image is on my other computer though. I'll try and transfer it later >.>

the image was printed on rice paper and put on a plain cake (for anyone who wants to make one). it left everyone with a blue mouth, lol. ^^