If you like the weeping look, you could try taking any variety with relatively thin, horizontally growing branches and attaching light weights to the branches. That will bend the branches down, and phototropism will keep the tips growing up. You should get a nice wavy look. I'm pretty sure that this would work for LSU Purple and JH Adriatic, maybe also Vasilika Zika. I don't think the method would work well on relatively upright varieties with slower growing, more stiff branches, like the Mt Etnas.