Business typically uses standard tools and solutions but configures and adapts them to own specific. Same situation is with business processes.
As a rule, business does not start from a ground but reuses already existing patterns already established for a specific field or industry. In this case we have an implicit use of process templates already utilized by other players.
Business software often ships with ready process templates for various types of business. For instance SAP Solution Manager offers a rich collection of business blueprints prepared for various industries. These simplify and accelerate implementation.
In many situations designing entirely own processes is simply not allowed. Many areas of business have strict government regulations and compliance requirements. A process will not be approved, unless it follows many formal restrictions in this case.
In general, question about design own business processes is roughly equal to the question of design own business. As a rule, it is very risky to devise something entirely new from the ground. Normal practice is an adaptation of already existing patterns, which proved to be positive and beneficial.
It is equally relevant both for amateurs, who can hardly design own processes due to limited awareness and for process professionals who, by virtue of experience and education, use own patterns accumulated in their previous career.
Having well established base of documented and implemented processes, anyone can design and discuss its further improvements. Moreover, it is essential that ordinary workers of organization were involved into this process of process improvement, apart from business architects. This guarantees higher involvement and acceptance of process management among all workers and better effect on implementations.