I analysed the anatomical structure of concept maps and applied graphic design principles to their visual appeareance according to the results of this analysis. The templates used in a CmapTools website can be browsed individually in the documentation page at https://cmap.ihmc.us/docs/documentation-cmaps
Commentary
I posted further insights on the underpinning information that went into designing these templates in the Anthrodesign list. My post "A practical experience with Tufte's work" contributed to a discussion titled: "A book waiting to be written" and is dated Oct 6 2008.