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Food-grade diatomaceous earth is a natural product that comes from diatoms—fossilized aquatic organisms from tens of millions of years ago. Food-grade diatomaceous earth is considered "natural," while pool or filter-grade diatomaceous earth has been treated and transformed to have higher crystalline silica content.

It depends. High-end colored mulch can be fairly costly. However, you'll have to replace less-expensive natural mulches, like pine needles and cedar mulch, more frequently. 

The cost is balanced out somewhat, though, as although you'll have to replace colored mulch less often, you'll have to replenish nutrients in your soil more frequently to make up for the decrease in organic matter and nitrogen from the mulch.

Yes, rotting leaves can be good for your soil. The decaying leaves release nutrients into the soil that can boost the health of your plants, and the organic matter also helps improve airflow and water drainage.

The depth of your decomposed granite depends on its intended use, but around 3 to 4 inches is the most common depth. Driveways that need to support a lot of weight should be at a depth of no less than 6 inches. Walkways that won’t see a lot of weight but lots of foot traffic should be built at a depth of 3 to 4 inches, and patios should also be between 3 and 4 inches deep.