Sedum rupestre
Sedum grisebachii
"Sedum passalong": passed from my childhood neighbors to my mom to me!
Sedums are very forgiving of hot, dry conditions and are thriving tucked into the rock wall around my pond. They are also the easiest of plants to transplant and divide, just pluck off part of the plant, stick it into the soil and water. They provide color, flowers and some, like the one in the top photo, Sedum rupestre turn orange in the fall and winter! Sedums, however, do not respond well to foot traffic, so put them out of the way. If you want to figure out what sedums you have, there are sedum identification guides online [for example: http://www.sedumphotos.net/main.php], but it is a big task.
Happy gardening!