I wonder why this idea has never come on my mind before.
Use special characters window (on Windows: Win+R > charmap) to add some symbols \ pictograms to the track name.
I am not a big fan of using colors for every track because I don’t like when my project looks like Ara parrot.
And I’ve discovered that using some chars helps me a lot to find the right track with eyes in project view and Mixer.
In the project view some characters looks even more distinct than track pictures.