I crop 'em - and you should too! :)
I don't like big areas of the same or similar color, sky being best example, but also roads, etc.
So I crop them out.
I use a desktop computer with a full size monitor, and don't see why you would want to do this on smaller screens, I suppose many do.
So for that reason, I like 1.4 - 1.5 aspect ratio (I know that's not a ratio, but you know what it means :)
Multiple bright colors, and lines - straight, angled, etc. it's easier to build along a line.
Is there a forum