Castle ruins tileset

I'm trying to make an exterior tileset that includes ruined castle walls, and Ace unfortunately doesn't come with any. I saw a tutorial video on Youtube that looked like it was from XP that had some proper wall-ruins.

It's a snow tileset, but as long as there are some tiles available with brick walls cut off at corners or with holes in them or something like that, that would be fine. It just needs to look like it's crumbling. I can use the piles of rubble from the default tilesets for a lot of the interior stuff, but I'm sorely lacking on being able to just make the outer walls of the castle look like they've actually been damaged (short of adding in some tiny cracks, which just doesn't do it).

I do have some towers around the corners, and I'd love to be able to add some crumbling tiles to those, as well, but if that's too much, I can always remove them and just have basic wall ruins.

If anyone knows where I can find such a thing, or would be able to produce one, I'd greatly appreciate the assistance!