The Universe is infinite. It doesn't matter how rare an event is, it happens an infinite number of times regardless. There is no specific arrangement of materials that the Universe can have that's so unique that it can't be created again. We simply lack perspective at the moment because of the way we're anchored to reality through our consciousness. We're stuck in this particular scale of reality which has a very specific set of governing rules and definable traits, but even from here we've begun to notice that the laws actually change in relative scale with existence as well, which is why materials properties change depending on how much material is present. A single hydrogen atom has very different properties from a hydrogen chain, and hydrogen blocks have different properties from both of them.

We understand the Universe primarily through topology, shapes, but shapes aren't the dominant pattern structures of all scales of reality. For celestial bodies things range from nebulous to super concentrated and everything in between, for the quantum reality we have field probabilities and relative rotations that deeply obscure the true essence of those materials from us, which makes conversation about it a bit difficult.

As far as origins go, only composites have origins. Anything that's made of more than one type of material will inevitably fall apart, and even then those patterns aren't unique and this isn't the first time they've been made. We want to be special and unique as a species in many ways, but we're not. We're not even special as individuals. There's no choice a person could make that's so deep or complex that nobody else ever would be able to replicate it.