Recently, I was browsing the interwebs when something intresting caught my eye.
wcif a tutorial similar to this one for sims 3?
original tutorial: http://www.modthesims.info/showthre...656#post2190656

You mean for fixing the way the wall warps when using CFE-like in this picture how connecting a garage to a house on a foundation warps the wall? If that is the scenario you are referring to, I am not aware of any tutorials for mods but that is usually "fixed" by using a wallpaper that doesn't use lines or patterns(basicly a flat texture over that section).

What the tutorial that OP linked to is how to make new walls for TS2 that compensate for the warping that happens when CFE is used. Essentially, you create a texture that's warped in such a way that, when it's applied to a CFE-warped wall, it no longer looks warped because the warped wall stretches it out properly. I'm not certain this can apply to TS3 because it uses an entirely different method of "painting" walls (and everything else) with the whole pattern thing. The way around it, though, is to use wall patterns with no horizontally-oriented patterns, yes. So, vertical wood siding would be OK but not horizontal wood siding.

That said, rather than screwing around making walls, the better thing to do, in TS2, is to replace any warped walls with unleveled walls instead. With those, you can then "paint" them with any texture you like, no special ones needed. But I don't suppose something like that exists for TS3.