Lumiere acrylic paint makes a wonderful antiquing medium. It is definitely different than using an opaque medium like Ne-Opaque, but beautiful none the less.
Punch the color in to a baked piece with a large stencil brush, I use a ½” or bigger round stencil brush. Using a damp but not soaking old piece of bath towel I wipe and if necessary rub off the excess paint.
This chart shows Lumiere colors on black and white Cernit.
The Clay Factory carries both the Lumiere and Cernit Phthalate-free clay.
I have pictures of other examples of standing shrines on my web page http://www.mariesegal.com/ under the shrine page. All of them are antiqued with Lumiere or Ne-Opaque. Another wonderful thing about these paints is they can be used on a lot of other canvas beside Polymer clay, like fabric, paper, and leather.