Maybe we can use this thread to talk about how clunky and flawed the metaphor is.
I feel like a rhinoceros with gingivitis when I try to say it. And it doesn't make sense. Collective creativity as a metaphorical destination doesn't work, unless you see it as an end in itself, in which case plot bunnies would not be conducive towards creativity as a means, but rather the output of collective creativity. And the output of collective creativity is not solely dependent on plot bunnies, but also on a great deal of direction, structure and control. The plot bunnies are a foundation, for sure, but not a paving. "Paving" suggests a concept is omnipresent and implicit in every stage of the process, but this particular concept is not. There are times when plot bunnies are not enough to guarantee creativity.
In short. I fucking hate that catchphrase and it should die.