I am quite anxious for a Trillian Pro skin as well.
Just out of curiosity, would it be possible to make an application to extrapolate the graphics/colors used in a visual style and use them in a very basic Trillian Pro skin (I would assume the stixe model would make the most sense for this)? I obviously don't know a lot about Trillian skinning, but it seems like only a few things need to be changed from the basic template (color scheme, and title bar graphic/controls, and I guess the font face/size). I am sure this is much easier said than done, but new icons/layouts aren't needed just to match the visual style...
Looking forward to this skin to whomever is working on it.