This paper claims that a speculative design space exists within the crafting of digital rule-based associations in parametric modelling environments, which promises to support potent contemporary designs in architecture. In addition to reviewing some diagrammatic frameworks located within the techniques of associative design modelling, this paper also details a project for a research-oriented practice based on the development of a registry of digital diagrams called “re-usables.” Working with “re-usable templates” of association, a precise sequence of design logic is invented for each project, while some of its aspects are re-used and re-configured. Such practice aims to operate between the “one-offi world of the all-custom and the entirely reproducible world of “copy-paste.”