Today’s relevant shout-out goes to Destiny: Rise of Iron for its depiction of a nanotech bloom as something other than the traditional (boring) homogeneous gray goo:

Meet SIVA:

So many of the probable phases, all on display: the hard-shelled geoms (which I conceive of as processing nodes) and bundles of organic-looking transport/processing motile cables, both growing together and through other objects; hazes of foglets, both being excreted by other constructions and moving independently; and (not pictured), streams of liquid nanite soup glowing lava-like with the radiant heat of active [dis]assembly.

If you’re looking for a visual reference for what I envision rampant nanite blooms to look like in the ‘verse, you could do a lot worse.