I'm a big fan of the tangotango Emacs theme: https://github.com/juba/color-theme-tangotango It now has matching fringe colours, for a cleaner look!
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On the challenge of measuring spam prevalence externally, because historical data tends to be cleaner:
Measuring programming language popularity based on the number of unique users on GitHub: https://www.benfrederickson.com/ranking-programming-languages-by-github-users/
Whilst this gives the dataset a FOSS bias, it's much cleaner data than e.g. a keyword search of job postings which some other metrics use.