We just did some Razorwings for Richard Allen, a returning Dark Eldar client. He had an idea for using the shadow grey elements of his paint scheme, for the recesses of the Razorwings. It came out rather well I think!
What I feel also works well, is how suggestive his main basecoat color is, of wraithbone.
Under the new edition the Dark Eldar can have Eldar allies, so we did a few of those for him as well.