For a bog, is there any else that can be used as a top layer in order to make it more visibly pleasing? The look of brown patches in the middle of plants might be tacky to some. I'm planning on making a bog that would be put in a high traffic commercial area so overall look is kind of important.
Would dressing the top layer with small washed pebble sized rocks cause any problem? The only thing I can think of would be them sinking, unless they do something crazy to the soil composition.