Download link for all of the strategic icons pictured in this forum post:
Here are the icons that are presently used in "Penguin's Icon Mod" (which is available on the vault):
Here are some alternative icon designs that had some merits but didn't end up being used:
As with all of the icons that will hopefully be shared in this thread, others are free to use any/all of these icons in FAF UI Mods and improve upon them further.