Where can I get the default templates?
How do I restore the default templates, forms, and styles that came with Textpattern?
I messed up my default template/form, how do I fix it?
The default templates, forms and styles that come with Textpattern are all listed in Textbook:
You can save or restore them into your Textpattern site by pasting the contents of each into the edit interface – presentation > templates, presentation > forms, or presentation > styles.