Here is the igloo cake I made for my son’s birthday. It was pretty easy but a little time consuming (because he wanted the penguins too). The recipe for the cake and trees is here.
The penguins were made of gumpaste. Here is the tutorial I used. I, of course, modified my penguins.
For the display, I used these containers to add varying heights for a more interesting look. These little containers are so practical, I have used them for many things like mixing paint and icing colors. Best part? I get tons of them for free when I order take out.