If you create your own promotional materials, then these two books are ideal for you.
The first one is Japanese Border Designs, perfect for decorating props, or just using on your stationery. Black & White, as well as color designs. Includes CD-Rom with all artwork. Retails for $5.70.
The second one I utilized a lot over the years, Alphabets & Ornaments. If you are looking for ornate alphabets, Victorian style backgrounds, printable pages for scrapbooking your career, then this is the book for you. Includes CD-Rom with all artwork. Retails for $14.95