For, if right and wrong are merely human constructions, then an individual's morality is little more than a set of aesthetic judgements. We might then each have our own esthetic notion of how we would like things to be and call it morality, but it would be inappropriate to impose our esthetic sensibilities on other people. I have called the hypothesized source of this morality the Cosmic Creative Process. There clearly is some kind of existence. Even if one rejects materialism and suggests that there is only mind, then mind exists.
Creativity is less obvious.
My case for the existence of creativity rests largely on the observation that there is consciousness. Physicists informs us that things are made of atoms, but atoms do not explain consciousness. I suggest that the existence of a Cosmic Creative Process is the best hypothesis to explain consciousness. Furthermore, the Cosmic Creative Process seems to me the best explanation for our own, individual sense of self. It is hard to imagine that our own, individual senses of identity are just accidents of a material Universe.