Is there a pattern to create a library

Is there a pattern to create a library in general or libraries are usually combination of few patterns?

I have a project where my data structure makes it efficient to operate between sets(like finding union, conjunction, disjunction etc.) and using the patterns I know is not useful for me in this case. Which raises this question: Is there a good way to organize your library without putting them all in one class with bunch of static methods or every case of creating a library is unique?