How about using the animals on the paper goods as patterns for chocolate transfers? You could make the chocolate transfers ahead of time, ice the cake, and add the transfers around the sides of the cake ~ not on top. Then write on top. Chocolate transfers are EASY to do. Email for instructions if you don't know: email@example.com
I made a cake with just these animals for my great-nephew, check in my photos and you will find it, I even made a small smash cake for him to match. it was pretty fun, I made them all individually a FBCT.
I did a cake for a first birthday made from these. I did blocks with the animals as CT's. I used pink electric colors becasue she was a girl, plus made a small block for the smash cake. Sorry I don't have it in my photos.
Thanks all! I have that last picture in my favorites - I love it!!!