I am using sfAdminJrollerTheme Plugin for some parts of my application, but when I generate new modules without admin generator, I lose same look and feel than jroller in my other application pages. I know maybe is good idea to use admin generator for everything but I cannot change all my modules.
Regards,
If you do not use the admin generator then you have to create your own look and feel using HTML and CSS.
Have a look at the generated files that exist in the cache folder to see the PHP that the admin generator generates.
The admin generator is excellent for making simple modules for manging data. Plus they can be built very quickly, but I would not advise using them for everything.
Creating a basic module and developing your own custom functionality is much more powerful.