You will need several succulent cuttings to complete this project. Echeveria, Gasteria, and Pachyphytum are all common choices for wreaths, but you don't have to be afraid of using a more unusual variety like Portulacaria or Euphorbia tirucalli. The Graptoveria may have similar leaves to Echeveria depending on the variety of Graptopetalum used. Or the leaves might be more round and bulbous. To simulate a finished wreath, you can lay your cuttings in a rough circular shape if you have them all ready. Poor drainage can result in severe rot. This will stop the cuttings growing.