Lately I've been working more on pangoterm again. A few days ago I was feeling oddly artistic, and decided to draw an icon for it, to distinguish it in window lists, etc..
I use a variety of differently-coloured terminals to represent different scenarios (mostly SSH terminals, picking colours to represent different machines), by changing the background colour.
I thought to myself "wouldn't it be great if the window icon
could change background colour to set the actual background colour used
by that terminal window".
So I did that.
By a little bit of custom CSS hackery, it loads the SVG via a stylesheet that overrides the fill colour of the background colour element, and sets it to the colour chosen by that terminal. The upshot here is that the icon used in the workspace switcher, window list, and other places, looks like the terminal window.