In the Site Icon stat there's the format expression
'{' + format('IMG:Icons/site_{1}.png:55}', 100)
I realize the stat can't be used in the HUD because the underlying column groups by, but is there some way (couldn't figure out by myself) to display a .png in the HUD (kind of the way you currently display the notes box), based on a stat value? This would be simply HUGE to enable badge type and spark graph type stuff. I'm currently in the process of creating a custom font to do this, but a .png type approach would be somewhat more elegant.