Stamped concrete is regular concrete that's colored and pressed with textured mats while it's still soft. Done well, it looks like natural stone, slate, flagstone, brick, or even wood plank, without the gaps that let weeds and ants into a paver patio.
Start with the pattern. Large ashlar slate and random stone patterns suit many homes and hide minor surface wear well. Brick and cobblestone patterns work nicely as borders around a plain broom-finish center, which also keeps costs down.
Color comes in two layers: a base color mixed into or broadcast onto the concrete, and a release color that settles into the texture to give it depth. Pick colors in daylight next to your siding, trim, and roof. Earthy tans, grays, and charcoals age better than bold reds.
Timing is everything with stamping. The crew has to stamp when the concrete is firm enough to hold texture but soft enough to take it, and that window moves with temperature and humidity. Experienced crews plan the pour size so they can stamp every section at the right moment.
For upkeep, stamped concrete should be resealed every two to three years depending on sun and traffic. Sealer protects the color, deepens the look, and makes the surface easier to clean. Avoid deicing salts, and sweep off leaves so they don't stain.