Form the concrete as you normally would. Forms can be built using 2-by-4-inch boards or pre-built models can be purchased from your local home improvement store. Stake the forms firmly into the ground before you begin your pour.
Spread a base layer of gravel across the formed surface. Use a wheelbarrow to move the stones and a shovel to spread them. Gravel should be 4 to 6 inches thick.
Blend concrete mix and water according to the instructions on the package. Place the mixture into a wheelbarrow and blend it using a drill with a paddle bit.
Pour the concrete mix into the forms. Use a trowel or hoe to spread it evenly across the surface. Leave a ¼ -inch gap between the top of the poured concrete and the top of the form.
Add a single layer of pea-sized gravel across the top of the wet concrete. Use a stiff broom to spread the gravel over the entire surface.
Use a 2 by 4 to press the aggregate gently into the top of the concrete while it is still wet.
Wait one to two hours to let the concrete begin to dry slightly, then use a lawn roller to firmly pack the aggregate into place.
Sweep the surface of the concrete with a stiff broom to wipe away any excess material from the top of the aggregate.