How to add aditional bullets and borders in writer?

how can i install or additional bullets(especially for persian language -in right to left bullets-)
and adding additional borders?
the current borders,bullets ,… are too few and old?

Take a look at numbering and menu Format → Styles and formatting → pick list styles (fifth icon from left), and change any style (right click, edit). In the bullets dialog pick Settings → and from Numbering dropdown choose “Image” (this list is cluttered, take time to find it) and off you go, select an image. Or you could use bullet instead of image and pick any character you like.