I think it would be nifty to see a system of unique and semi unique buildables. These objects would be very expensive for minor permanat time-based buffs. E.g. an extra wyrd per ritual during a new moon for an object requiring a dozen steel and a nugget of gold. The building of such objects would be tied to authority and village membership.
I don't see another system of determining who should recieve buff from such objects but i would think that if private and village claims were integrated into some cumulative accruement of function that this would make it more reasonable and attainable by smaller settlements.
Unique objects would of course be globally unique and semi-unique would be unique to each village. I should think that this owuld integrate with religion in that some semi-uniques would be incompatable.
The way I ouwld see these things work is to only have one semi/unique buildable at any given time available to be built, globally. That the first to build said object changes the availability to a different object. What object is available is also based on seasons. These objects would be idols of a sort to memorable characters and/or troupes from past ages (such as the 'statue of blaze'), well known norse, germanic, and slavic deities. Lesser spiritual figures such as sprites and the like would definitely be excellent 'semi-unique' objects. Buffs should not be cumulative but the strongest one should apply. If they were to be cumulative in some fashino they should not be fully cumulative. For example the strongest one might give it's full buff and thereafter others might give a fraction of their buff. Overlaps might not always apply depending on the condition of the buff and naturally only if said buffs are the same anyway.
This isn't an idea of any immediate concern obviously. Would require a fairly complex system and a complicated decision about how to handle half-built statues various people would be working on once the first one is built and the given object no longer becomes available to be built but it's a nifty quest-ish type thing that would provide us with distraction from time to time and one of the things I think people love about this game far more than the aspect of character development is the building of cool shit and owning that construction. it would also, obviously require a fairly large list of available things to cycle through attatched to seasons and tod and such. And then of course...the art for all of that.