As far as I know, we've got icons for PHALANX base, alien base, aircraft, and two mission icons.
I only see 2 in /models/geoscape/
...the same 2 that i've only seen in the game, an alien icon and a PHALAX base icon
No. Storyline missions are special and should have their own special icon so that they are never confused with anything else.
I understand the importance of making storyline missions obviously distinct. However if there are (for instance) Storyline Terrorsite missions, Storyline Crashed Ship missions, and Storyline Alien Base missions etc., the best approach would probably be to start with the standard icon for those two things, and than add an additional, consistent element to indicate the "Storyline-ness" of that particular item.
No, I'll post one up later.
Thanks, i'd like to take a shot at designing the whole series of icons, once we get the whole list. It's easiest to make things obvious and clear when you are aware of the big picture.
Also i believe it would be best if the orientation of the icon always pointed to the top of the screen, not towards the north pole. This would help the player "read" the icons since he would never see them sideways or upside-down.