When Michael asked me to do a salt shot, I thought, "what can I photograph the salt on that's interesting and makes sense?" Salt—mined—rock—salt of the earth—Hey, I can use my Home Depot slate floor tiles. I bought some that are 12X12 inches and some 5X5 inches. I'm the kind of girl who likes hardware stores so I have fun looking for interesting inexpensive surfaces and props just about anywhere.
And as long as you're taking a shot like this to illustrate a point, take some others for future use.
I love these tiles so much I'm afraid I'll use them too much. Here they are used for a bread shot taken not so long ago.
I stood one tile up in back and blurred the crack line where they met in photoshop.