All I know for sure is they are succulents. I know that is not much help, but I'm going to post a website that should help you. BTW, it's a great site, and they have some "how to" instructions for making succulent living wreaths.

Here is a link that might be useful: Simply Succulents

The first I would guess is an echeveria, graptopetelum or hybrid. The second is a sedum that I've seen a lot and just can't remember the actual name of, sorry.

The plant on the right looks like it may be Sedum adolphii or perhaps Sedum nussbaumerianum. It looks like my S. adolphii, also call Golden Sedum.

Plant on left is Graptopetalum pentandrum superbum

First one is a superbum (i luv mine, been trying to find another cause I've had no success propping this guy!)
I think the other one is sedum or this other plant i can't think of the name at the moment...Grrrrrrrrrrrrrrr that's gonna drive me CRAZY weather I'm right or wrong!

Yes, Graptopetalum superbum (raised to species level, dropped pentandrum) & Sedum nussbaumerianum.