They're easy to start from seed and require little maintenance once established.
Seed is available by the ounce at nurseries and garden centers.
Grasses look good in flat containers such as clay saucers. Plant them in fast-draining potting soil that's been amended with sand. The shards should be clean to prevent transferring diseases. Label the seeds with a waterproof marker, noting the name of the seed and the planting date. Keep the seedbed moist by misting until the grass germinates.