Things like Barrels (full/closed, empty, even ones with fish inside/hanging out), Boxes, weapon racks, armor racks, pottery, even a pile of rope. Paintings, miniature statues and dolls. Some of these could even be craft-able, while others could be introduced as prizes for events/burred treasure/plunder and loot.
I approve, would certainly give some life and detail to large builds. Many of these things COULD be fully functional too, though. Perhaps as a 1.0 release or later?
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