Placeable wall panel decorations (request!)

So I’ve been trying to find ways to add additional details to my builds and recently lost all of my builds that I’ve saved over the past few years, sadly. But I was wondering if anyone could come up with some wall decorations? I was thinking wooden wall panels thin enough to add depth without taking up full block spaces? maybe placeable blocks that look like the stairs from minecraft so just a block missing 1 corner in different directions so you can create archways properly in your builds and the like. Not sure if anyone’s up to taking on this kind of mod but I’d love to see additional decorations that can add details like this in simple but effective ways.