Here is a link to an article titled “Personalize Lightroom to Improve Your Brand“. In it the author discusses several ways to personalize Lightroom including the identity plate, panel end marks, the start-up splash screen, watermarks and more.
Though it is aimed at professionals running a photography business, I have found the information found here to be useful for me as an amateur. From the article I learned how to customize my panel end marks. They now contain a color-coded guide to how I use color labels and pick flags. When my memory fails me, the end panel is there. 😉 .