How do I make my own wood icing?

I have been experimenting with stencils and have found that Texture Paste by "artEXTRAVAGANCE" really works well and looks spectacular, but is a bit expensive to use it as much as I'd like. Can I make my own? I assume I would have to have very fine sand, but where do I find the right kind, and how much do I use. Or is there a lot more to it than just adding sand to paint? Thanks to everyone for the really wonderful ideas I have gotten from so many of you.

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