Bad news: TiEmu uses its own skins; they are
Why? Because the VTI skin format is somewhat limited and doesn't take care of some portability issues.
Good news: You can re-use your VTI skins!
Well, how can I use or develop TiEmu skins?
Julien Blache has developed a multi-platform skin editor, called SkinEdit:
SkinEdit has all of the basic functions
skin editor and some add-ons: