just some random suggestions for decor cuz all of the decor rn is kinda mid
house : itll just be a basic house, itll have multiple tiers like a lot of things, youd be able to place up to 20 of them, theyd look like ravenna or cirrus houses because those houses kinda just look like general whatever houses, not sure if you should be able to go inside them or not
no stall merchants : basically more of just positions where castaways would go to run a stall but without the stall, itd just be the castaway, when in build mode there will be a transparent circle or something around them so youd be able to edit it easily without losing where it is
walls, celing, roof, flooring, door walls, and window walls, stairs, stairwell: basically, just wood walls stone walls plank walls, youd be able to place them, theyd just be a wall is the best way to describe it, not a big one, more like one you could use to serparate rooms in keeps, or build custom houses, i just think this would help in a lot of places, you could place 500 of these the amount being separate from the normal decorations
clan leader statue : itd be a statue displaying the leader of the clan/guild, you can place 3 of these, not particularly sure if this is possible 
map table : itd be a table, with the map of the sea on it, itll show the locations of other members if they are in the same server, when a member in the server discovers a diving spot, itll be shown on the map table as well
armor stand : youd be able to put armors on it and itd display the armor, and yes, itd look like an armor stand even with armor on it
painting frame : youd be able to place it on walls, and add an image similar to your brigs frames
armor display : this would be like the armor stand, but itd look less like an armor stand with armor on it, looking similar to a player character if they were made of wood, itd display the armor as if it were a character, this could be used as like vanity guards or npcs
display case : itd display whatever reagent or catalyst you put in it on a pedestal inside a glass box
weapon display : itd display whatever weapon you put in it on a long stone table where the weapon will rest
throne : not much to say, its a throne, yknow, this would be perfect to put in keeps, i BEG
sign : a sign, placing on the floor itll have a stick raising the sign up attaching it to the ground like the classic sign, hovering it on walls will make it lose the stick and simply attach to the wall, like a sign, and hovering it under things will make it chains attatching it to the bottom of said thing, thus, a hanging sign, youd be able to click on it in build mode to edit what it says
a ton of simple interior decorations :
bed, desk, bookshelf, ground lantern. empty shelf, anvil, small inkpot, globe, counter, potted plants, knight statue, mage statue, buff statue, small knight statue, small mage statue, small buff statue, fireplace, drachma and gems pile, chest, open treasure chest, braizer, tall braizer, pile of swords, pile of shields, sword rack, shield rack, pile of bows, pile of guns, bow rack, gun rack, empty rack, pile of random weapons, small fense, small gate, stone path, wood path, dirt path, brick path
please vetex, i need this, my base is kinda decorationless