My oldest son chose an Ice Age cake for his 9th birthday. I used icing to give it that snowy look.
The characters, eggs and acorns were all made out of fondant. The faces on the egg were drawn on with a food coloring pen. I made the "ice" with sugar candy. It was the first time I had used this and it was a lot of fun to do. I just poured the melted sugar onto a pan, let it cool and then cracked it to form the ice.
I was so happy with the way Scrat and Sid came out and I had planned on preserving them like I had the jungle animals. Apparently, my dog had other ideas because she ended up eating them. By the time I caught her, only part of Sid's body was left. It was very sad!
Here is Scrat before he was eaten...check out his fang teeth!