I wrote about gingerbread houses a few times last month, what with them being seasonally-appropriate and all, but one thing I noticed is that people who love building with food will do it whenever they want, not just in the last month or two of the year. There was a Valentine house, several houses that people mentioned waiting until January to build, and a few houses that, for one reason or another, didn't look "wintry" at all.
Last year, the creator's gang built a Battle of Helm's Deep scene, with techniques similar to those used here (except instead of color-coding gummi bears, as in the Pelennor Fields model, he used Sour Patch Kids to represent the good guys in the battle). Between the two, you'll probably get a pretty good idea of how to do something like this on your own. Start hoarding candy now for the next snow day!
(Those of you sensitive to strong language might want to skip this one. But I have to say: the creator is totally justified in calling his stuff *bleeping* awesome.)