Very cool, as usual!
Just because I'm me (and can't stand short, concise posts) I thought I would let anyone who hasn't seen them already know about CatherineTCJD at MTS who has used Pixwlhate's fullPoster overlay as the base for the "Great Wall Project", which makes all the Maxis walls (from all EPs) into "overlays" thereby letting you mix-n-match any boarder with any color/type of wall you want.
You can find them all
here in her MTS profile page. Also included are hiders for all the Maxis walls.
The only *problem* is that if you are using a texture that covers the entire wall, doors & windows will *disappear* under them...but that only effects full-wall overlays, not the boarders.
(One of the things I have toyed with trying to do is to see about making my own set of the full-wall overlays that were door/window friendly - like maybe in two pieces - but haven't tried it yet...)