Tray shelves

I'm at the stage in the house remodel where I need to come up with a game plan for storage/organization for two closets and two bathrooms, and I'm really, really liking this idea of using a tray as a shelf. In fact, it might be the perfect thing for the wall above the toilet in the master bathroom, where I'm wanting some sort of a shelf to hold bath crystals and such. I think this calls for another trip to the local antique mall in search of the perfect tray.