The two "dark wolves" in the main room:

And the obvious comparison to the "dark side" of Fen'Harel's only known shrine, representing him as Dirthamen/Falon'Din.

And a bit more of a stretch, but the imagery of the "split man" in the wall murals. Light and Dark:



With the additional interesting point of the interlocking stone pattern connecting into the repeating visual imagery around Solas: the idea of uthenera / ritual "mummy" wrapping, his own interlocking leather underwrap, and the Qunari adopted symbol:

These things all underscore the connection to Solas for me, but seeing Ghil represented in his temple like that is really weird. Andruil wasn't being paranoid - it looks like Fen'Harel may have indeed been "hunting the halla". owO