These are all the unique decorations that I'm aware of that can be pushed but not bought. I had some help from my linked sources and this list might not be filled with complete locations or items. I will edit this list whenever I'm able to.
Also, a side note if you have the Astral Portals mission in the Explorer Society quest you can use Orichalcum Pearls to travel from Port Hope to Northport and back. Also from Liberty Bay to Svargrond and back. This means you can teleport your items to these towns. This, of course, won't work for all towns...
Leaves
Some types of Coal Basins
Crystal Wall (Photo source: Popicii)
Filigree Statue
Small Golden Taboret
Ornamented Stone Table
Timber Chair
Wooden Trunk
(*There's two versions as you can't rotate this item)
Cabinet
Potted Plant
Ficus Benjamina
Areca Palm
Hourglass
Kidney Table
Venorean Chair
Venorean Stool
My first thought is YASIR!
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