I have used this wonderfully simple technique (classified as a reframing exercise) endless times when working with clients. It's not necessarily about the 'silence'...I believe silence is so often referred to with this because it ("just being") can allow someone to 'go inside' and search for more honest answers. But this brainstorming is essentially a mind-map where someone explores any and all options/possible responses to a given situation or problem, often with the goal of taking the best pieces of options to form a new, integrated solution.
Dr Murthy regards 'Kaleidoscope Brainstorming' (KBS) or Multiple Mind Conferencing (MMC) as a "...Romantic interplay between silence and interaction.... a heavenly marriage of thesis and antithesis.."
The process makes efficient use of silence and communication, which are interleaved in the brainstorming session. The various degrees and modes of silence and communication effectively use as 'tools' in the Kaleidoscope brainstorming approach. Notably the power of silence is used to supplement the communications-oriented parts of the session.