I'm going to put up some new frame stencils in this thread.
Import the colour (top image), alpha (second from the top) and mask (third from the top) stencils into AR.
Experiment with painting the colour stencils, using different layers to build up variations/textures and remember to invert the stencils as you go along. I find painting on the stencil on one layer, then adding another layer and inverting the stencil before painting on the stencil on the new layer (with a different colour), produces interesting results.
Use the mask stencils (plain black/white) to erase overpaint or to prevent going outside the borders of the colour and mask stencils.
The alpha stencils can be used to create more depth if necessary.
Remember invert stencil, add layer and blend are your friends.
The first one is called "concrete". Click on the attached images and let them open fully in your browser before saving (otherwise they sometimes end up blank when importing as stencils). See the example image (bottom) of what they look like in AR.
Will try and add more soon.