Patterns aren't manufactured or created. They are mined from empirical, proven practice.
Once mined, patterns are refined in WritersWorkshops by PatternSmiths? (or PatternJewelers?) who polish them into beautiful works of literature.
There is an article on PatternMining in the C++ Report of October, 1995 (Volume 7 Number 8), for which the abstract is:
New projects are using these patterns as an architectural basis; existing projects are using them as architectural documentation. Patterns have found some surprising applications as well, including requirements generation and validation.
-- JimCoplien 1996/11/10