Name: Ian McBeth Lincoln, NE (Zone 5b) Try Naturalizing perennials! :)
I do know a few of the species in this picture but I can't give you their exact names. There might be some people on here that can give you exact names.
What I see are a few Hens and Chicks (Sempervivum) and a jade plant (crassula) one of them is a cactus, but I don't know what species or name.
Not only people give others signs, but plants do too.
First plant is an aloe, could be one of several, too young to tell. Second plant looks like an Austrocylindropuntia crest. Third plant maybe Echeveria purpusorum. Fourth plant Haworthia limifolia.