Midwest Everlasting Memorials has a variety of flat/grass markers. Flat Markers are a single piece of granite (usually 4" thick) placed flush with the ground.
This type of marker does not require a granite base but does require a foundation. Some cemeteries only allow flat markers because they are easy to maintain.
Flat markers come in different sizes for example; a single person marker is usually 24 x 12 x 4 inches. A companion marker is usually 36 x 12 x 4 or 48 x 12 x 4 inches. Each marker can be designed to your own personal preference. They are offered in many colors and a choices.