For Ne, I have a mental image that I developed which I think embodies the qualities of Ne. I see Ne as a large open field, with basic factual tenets erected as pillars, or totem poles or whatever. These are interconnected by strings, or maybe "cobwebs" would be a better way to visualize it. These interconnections embody the link between ideas, with the Ne process causing one to "walk" from one idea to another, all while keeping a short ball of yarn unravelling so you can jump back to the original idea. When one zooms in and focuses on an idea, Ne would show you a full manifest of branches to different related ideas; the shape and form of these branches, cobwebs, strings, whatever all tell you something about the relationship between those ideas.
This may be a source of amusement for some because the ideas which interconnect to another idea may be surprising at times.
I keep wondering about something though--the ideas themselves, the totem poles in this vast field, are those Si impulses? If so, it would represent a symbiotic relationship between Ne and Si where Si impulses are steadfast ideas, and Ne represents a vast, complex fabric of connections between those Si impulses. It would imply that Ne impulses always have a measure of Si involved within them (as Si impulses are the source and target objects for every Ne connection), and Si always exist in an interconnected fabric of Ne.
Just an idea. (I'd love any criticism, associations or elaboration on this)