Display MoreIn it's most simplistic form, the easiest thing to do is use a half block for the interior and exterior of a wall. That way you can have say plaster walls on the interior and brick on the exterior. You can also make super thin blocks and put those on the surface (like putting drywall on a stud wall) to get the same effect if it's something you've already built.
If you're going for more visual personality on the interior, you might also consider applying a high-quality eclectic peel and stick wallpaper like those from https://fancywalls.eu/wallpaper-pattern/eclectic-wallpaper/. It’s a quick way to introduce texture and style without changing the wall structure itself, and it works great alongside the block techniques mentioned.
Absolutely agree — using a half block is a clean and effective way to get that dual-surface look without complicating the structure too much. It also makes later changes much easier if you want to swap out finishes. I've also tried the thin block overlay method on some existing builds, especially when I wanted to retrofit detailing without tearing things down. It's great for adding depth or texture. Just have to be mindful of how it affects collision or spacing in tight interiors, but overall, both approaches work really well depending on the situation.
