>> I would like to see someone base a community on the principle of "Thine alabaster cities gleam, Undimmed by human tears..." <<

I like that idea.

"The White Tower of Ecthelion, glimmering like a spike of pearl and silver, its banners caught high in the morning breeze."

It's a challenging model of architecture, but possible.

A lot easier to obtain is a multicolored city. All that takes is some paint and a refusal to be boring.