Jelinda, the above photo is some of the plants growing in one of my raised beds. Your rock garden should provide a wonderful place for just about any hardy succulent to grow. There are many sedum that love growing in rock gardens. And the semps love it also. Then there are miniature plants of other types that would love your rock garden.
Sedum lydium
Mossy Stonecrop (Sedum lydium)
Sedum pachyclados
Afghan Stonecrop (Rhodiola pachyclada)
Sedum kamtschaticum 'Variegatum'
Sedum (Phedimus kamtschaticus 'Variegatum')
Sedum spathulifolium
http://garden.org/plants/searc...
There are so many it would take up way to much space to list possibilities here for your rock garden. Same with the sempervivum, all of them would grow in your rock garden. The best thing to do is browse through the database and find the ones that appeal to you.
There are also other tiny to small plants that would be lovely in your rock garden. Such as some of the alpine plants. There are so many treasures to be found.
http://garden.org/ideas/view/v...
I am just in the last 2 years finding some of them.