Select and purchase molds for making the type of pavers or stepping stones desired. Suppliers like The Mold Store offer a wide selection of molds for both. Purchase an adequate supply of pre-mix concrete to make the desired number of pavers. The cement can easily be colored to simulate the color of brick or stone or simply left in the natural gray hue, according to personal preference.
Prepare the molds by lightly lubricating the molding surfaces with a mold release agent. Commercial mold release products are available or ordinary vegetable oil can be used instead.
Mix the pre-mix concrete in a wheelbarrow, according to the manufacturer's instructions. Quikrete recommends a 4000 psi compressive strength mix for use in casting projects like pavers and stepping stones for use as patio and walkway surfaces. Empty a bag of concrete mix in a pile inside the wheelbarrow. Make a hole in the center of the pile and add water. According to Quikrete, you should use approximately 6 pints of water per 80-pound bag of mix. Add the coloring agent if used, and then use a shovel or garden hoe to mix the concrete.
Scoop the concrete mix into molds with a shovel, and then smooth the surface of the wet concrete with a trowel. Quikrete recommends allowing the concrete to set for a full day before removing molds and a full seven days before using the cast products.