The tt_news extension comes with a few templates styles located in tt_news/static folder. If you don't want to use them and to define your own template setup, here's how I did it:

add the following line to tt_news/ext_tables.php : t3lib_extMgm::addStaticFile($_EXTKEY,'static/modulis_css/','CRM tt-news CSS');

Then just copy/paste one of the other template setups (such as tt_news/static/css/setup.txt) and modify it as you see fit. From here, simply add  your custom static template setup as you would to one of their own.

Anh-Tuan Dam