Since version 2.5 WinTVCap_GUI is able to dynamically load LookAndFeel jar file packages.
To use the LookAndFeel from a package you have to copy the jar file to the directory lf in the WinTVCap_GUI program directory.
It's possible that not all LookAndFeel packages are working together with WinTVCap_GUI, you simple have to try it.
If a LookAndFeel package didn't work just delete it from lf.
Two LookAndFeel packages are available here. For the JGoodies Looks WinTVCap_GUI contains special functions to let you select the Theme.
Default LookAndFeels, these are coming with Java:
JGoodies Looks, this LookAndFeel package have to be installed first:
Napkin LookAndFeel, this LookAndFeel package have to be installed first: