Кулебяка is a traditional Russian dish: a big pirogue with some sort of filling. For the filling you can pretty much use anything (salty) you like: mushrooms, boiled eggs, spinach, cheese, rice, potatoes, cabbage, fish or whatever.
It's almost surprising how often it is made in the shape of a piggy.
A "svinokulebyaka" by meladan, posted in the LiveJournal community ru_piggy.
A sliced piggy-kulebyaka accompanies a recipe on the Russian recipe site kuking.net ...
This lovely kulebyaka was made by LarkinaL and posted on the photo community firstname.lastname@example.org.
For an English-language recipe, check out Moti's Iraqi cuisine (he has a hammer and sickle variation).
Other popular non-abstract shapes include fish and crocodiles.