I am planning a moon garden too, which will be a garden "room". Bordered on one side by the house and the other on the property line fence. I plan to have a path done with white granite stone and the beds bordered with white rock. A white bistro type table and chairs, a small white fountain, and a few other decorations done in white.
It's a mostly shady location. I have white bleeding hearts, astilbes, lambs ear, lamium (several variegated varieties), several artemisia's and several varieties of pulmonaria.

add nicociana and datura to the list

Some hostas have white in them, I bet the glowing white lines in the moonlight would be pretty.

MK