Hi, Smith, Thanks for the question and sorry for the late reply. The green carpet like plants are both moss and spots of sedum. I dont expect the sedum to do well here and the moss will likely take over completely. You can buy "Moss Rocks" from professional nurseries that are actually farmed and will look great in your shady, moist garden areas. The moss can grow naturally but in this case we bought and planted heavily to establish effect. This is a great shady spot with dappled sunlight. I have found moss to grow well in dappled sunlight vs. shade only. The areas need to be moist, but not overly wet. We used one of our specialties, drip irrigation line with built in drip emitters to keep the areas moist from underneath. Moss can be lifted fairly easily and comes up like a tupee' when disturbed too often. It is tough and an be walked on without too much worry.
If you already see moss growing naturally in the area you want to plant it, then you should have excellent results.