I would suggest getting a couple of earth-tone colors of a high quality exterior latex paint. Dilute the paints to a milk-like consistency, and then use a hand held(hand pumping) garden sprayer, or even a regular spray bottle to apply the colors to the rock. Mortar and cement are very porous, and will suck up the color. This will actually help 'seal' the rock, as well as prevent the rock from having a "painted on" finish-which often looks very fake.

Start out with the lightest color and coat the entire structure. Then, begin adding the darker colors methodically, so that you get areas which vary in color and darkness. It takes a little practice to get used to, so don't get too discouraged if it doesn't end up perfect the first time around.

Good luck, but most of all, have fun!

Cheers,

Bob
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Treemonitors.com

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