At every level your business
should reflect the quality and spirit of the business through its day-to-day business operations. This can be achieved through the branding of the business stationery and operational documentation and systems.
Typically the following items will fall into this category:
Business Cards
Letterheads
Complement Slips
Business forms i.e. Invoices, Statements,...
Email footer image
Presentation Folders
Presentation Slide Shows
Advertising Signature Styles
Product CataloguesAnd many more options ...
The important thing to remember is to maintain a consistency in style but still remain fresh in other aspects of the collateral to be designed.
It is also wise to remember that different items have different roles to play and will by nature require slight modifications for the specific document at hand.

Advertising Signature Styles