@ Voller: It still wouldnt solve the issue as all the narrow images would become so small that they'd look like thumbnails.
Not necessarily. If you consider the
not really nice one, for example: why would you need a square version of it? Aliens (same as humans) tend to be long and slender, rather than squarish, so any square version would not add any extra detail or information. The height of the alien stays exactly the same.
The same is true for weapons, which should possibly be centred on the vertical. Or even grenades, centred vertically and horizontally.
I'm not saying that extra detail isn't good. I'm saying that, if there is no square version of a picture (for whatever reason), there is no need to scrap or redo it.