The Lady Olynder model looks pretty decent as well with the right "floaty" feel. Maybe replace the little ghosts with scarabs or something.
James Grover over at Goonhammer has made good use of the Morghast Archai as well.
Sanguinius stood up, stretching his wings to their full extent. He flexed his hands. "I need no blade".
It was as though Sanguinius gleamed with pale light, his face white, eyes becoming blood-red, surrounded by the golden crown of flowing hair. Guilliman had witnessed glimpses of of his brother's wrath before, but had never seen the true Blood Angel unleashed. Sanguinius surged forward on alabaster wings, half a meter from the floor, whiteness streaming from him like flames.