I did a search on Mage Knight PDF terrain, and I found more than I expected: link. I had several of these items downloaded, many a year ago. I found more on this website, MageKnight.net, than I knew existed.
There are 2D dungeon maps, allowing a variety of setup's to be created from 29 different pages. They're a bit dated, but free is free, Baby!
Of particular interest to me, was the very large Gatehouse, and the Longboat, which includes eight pages of war banners and flags, at the end of the PDF.
I am currently building models of the Tower, using 2mm chipboard, rather than cardstock. I have two versions of this tower, rather than the singular version offered on this site (I have an older version which includes two towers, one three stories tall, the other is four stories tall).
These PDF's are of interest both for fantasy RPG games, as well as fantasy miniatures games. Cheers!