Draw an approximate diagram of your yard on graph paper. Use colored pencils to represent the general colors of flower beds, trees, and features like a pond or patio. Use a dark brown pencil to mark where you intend to lay dark mulch, including near the house, shrubs, deck or patio, and low-lying areas. To add contrast, use light mulch around trees and plants located farther from the house.
Turn over the soil in your chosen areas with a garden shovel. If the soil feels sandy or heavy with clay, add a 2-inch layer of compost or native topsoil to the dirt, and mix it in to add oxygen and healthy bacteria.
Use buckets or a wheelbarrow to bring dark mulch to your chosen areas. Scoop the mulch with gloved hands or a garden shovel, and spread 2 to 3 inches of mulch over the area and around plants.
Dig up grass under decks and along the sides of a patio or walkway. Dig up about 6 inches of dirt to remove the grass root systems. Lay down weed barrier to prevent weed growth, then fill the space with dark mulch.
Dig a trench 6 inches wide and 6 inches deep along the length of a walkway or driveway. Fill the trench with dark mulch until the mulch is about 2 inches above ground level to improve drainage.
Add dark mulch over one layer of a terraced plant bed, and use light mulch on the other layer to add visual depth.
Draw attention to a center garden or landscape feature like a fountain by spreading dark cocoa shell mulch around the outside, and light mulch around the inside.