I found this post – “Column: Grey is Every Blue” – a guess post by Rhyd Wildermuth on The Wild Hunt blog and found it to be very thought provoking and an important UPG for Rhud. I cannot just reblog it since TWH is a .org not a blog per se though it is written like a blog, so just hit the link above to go there.
I too have had similar experiences of Undines and Naginis appearing to me not so much in physical form but almost visible in the sun dappled water, and Definitely heard them talking and singing in the bubbling stream.
But his article is more than just that. It is one full of deep ponderings and insights. Enjoy.