Hire a graphic designer or consult your internal art department to design the look of reports, memos, and manuals. Don't assume you can do it alone. When a group of people work together, even loosely, it is possible to give an entire collection of documents visual coherence by using common styles. Common report covers and formats can, at the very least, give the impression that separately produced documents were coordinated and produced in a wellthoughtout fashion, even if they weren't. The templates are much more than a mere convenience to users, although convenience is an important factor in gaining use of the standard.
Templates provide a convenient way of encapsulating the project standard.
Just as important, they encourage the use of the standard. Of course, if you have the luxury of mandating the use of the project standard, encouraging usage is not an issue. However, management chains are often not straightforward, especially in large organizations. One individual should maintain the template files. Many people may have opinions about the style of the document.