In a custom house you can just use the northwest corner piece as a pole - maybe the bluish white marble, that would look the most silvery, or the "shadow" corner piece. Classic home you would do ok stacking any small item that can be dyed silver/grey or naturally comes that way. So stringless yarnballs might work alright, or a bunch of mondains coins, etc. Silver coins might be a little too small, and also have a graphical glitch (at least when in a stack of 2-5), an odd thin line that shoots out to the side.
If you want a base you just need an item that lays flat and can be turned with the dec tool, or already has a counterpart graphic that is turned the other way. And when stacked on each other makes a nice X.