It's really difficult to write up or recreate a project months or years later if you don't have some sort of chronology of steps and materials.
Some crafters and artists keep notebook journals of their ideas and projects. This method has the advantage of getting ideas down before they're forgotten, but the disadvantage of saving ideas in no particular order. As the books accumulate, it becomes harder and harder to find specific projects after the fact.
I still keep inspiration journals; but to help me remember and ...