People have proposed the idea that consciousness is the building block of the universe and not matter. See Itzhak Bentovs book Stalking The Wild Pendulum.
For usage in popular fiction & fun reading, take a deep dive into the lore of The Elder Scrolls, especially Morrowind-era content. In short, the universe is dreamed up by The Dreamer, and thus by definition is made of consciousness. Interesting consequences ensue as a result, especially for the few bits of consciousness (people) that become "lucid" within the dream.
This was all inspired of course by some parts of Hinduism if I remember correctly.
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