A palette with high contrast colors from Zeileis, Hornik and Murrell (2009): Escaping RGBland: Selecting Colors for Statistical Graphics // Computational Statistics & Data Analysis Volume 53, Issue 9, 1 July 2009, Pages 3259-3270.
Example for Thundebird tags in configuration file prefs.js
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Replacements of standard tags:
user_pref("mailnews.tags.$label2.color", "#63452c");
user_pref("mailnews.tags.$label2.tag", "MCK");
user_pref("mailnews.tags.$label3.color", "#0FCFC0");
user_pref("mailnews.tags.$label3.tag", "TDB");
Additional tags:
user_pref("mailnews.tags.alw.color", "#11C638");
user_pref("mailnews.tags.alw.tag", "ALW");
user_pref("mailnews.tags.da.color", "#D33F6A");
user_pref("mailnews.tags.da.tag", "DA");
user_pref("mailnews.tags.js.color", "#EF9708");
user_pref("mailnews.tags.js.tag", "JS");
user_pref("mailnews.tags.ws.color", "#4A6FE3");
user_pref("mailnews.tags.ws.tag", "WS");
user_pref("mailnews.tags.x50mp.color", "#8e063b");
user_pref("mailnews.tags.x50mp.tag", "MP");
user_pref("mailnews.tags.x90af.color", "#F79CD4");
user_pref("mailnews.tags.x90af.tag", "AF");
References for contrast color palettes: