I am using jqGrid 3.5. Can I change the style and look of the grid and make it more beautiful using jQuery or custom CSS or something else?
To elaborate on what Justin Ethier says...
Since jqGrid uses Jquery-UI themes, the best way to change the appearance of the grid would be to make a custom theme.
I would strongly recommend that you see if that works for you before attempt to modify the css after the fact... although you can do that as well, if the jquery-ui theme look is too confining for you.