Keep in mind too things like luminence with a fresnel can be really cool but often it won't show if the object is 100% transparent. Try bringing your white (the transparency amount) down to a 95 % gray and see if that helps.
There's also a couple of shaders in the legacy "extra" bundle that you can combine with transparency. Do a search for Danel or Mabel in the content browser and that will reveal where they are stored. (its not those two but I don't recall the shader's name, but it was part of the pack that included the two above)