Here's a prelim stab at updating the Pd icon: https://github.com/pure-data/pd-icon
Nothing fancy, simply recreated the current vanilla icon using DejaVu Sans Mono from an actual Pd patch print export. Now in *high* resolution. This repo generates all icons for Windows, Mac, & Linux (I assume): there is also gif that TK can load natively. I believe I got the sizing and padding around the icon pretty well (at least on mac).
Not to discount Paul Rankin's mac icon refresh which got this going (and is arguably better than the flat vanilla approach I've taken):
The makefile can generate the icon from a 1024 master which can be changed from my prelim export.
One issue with the original proposal is that there wasn't really much of a discussion overall. Now would be a good time to revisit this. Once something is agreed upon, we just need an SVG and 1024x1024 PNG to generate the icon sets.