The following is a very short performance for a promotional video for the Lumatone keyboard, but I have it saved in my playlist because of how beautiful it is.
I think it demonstrates the vastness of the musical realm by splitting the notes we typically associate with western music into different (and often more numerous) divisions of the octave. One of the best applications of this besides getting that ethereal feeling is that it allows you to explore intervals to a finer degree i.e. achieve cleaner melodic and harmonic tones that are mathematically pleasing to the human ear and mind. This whole concept is called microtonality if anyone is interested. And to your question, OP, I think searching in this area can help you find some of that cosmic, alternative sound you’re looking for.
I know I got a little bit away from the question here, but getting into the microtonal/xenharmonic realm was so magical for me because while I enjoy your typical music theory teachings, I’m very much on the more scientific side of things, and music has always been that intriguing intersection between the indiscriminate and cosmic nature of mathematics and the emotional and beautifully flawed nature of artistic expression. Finding the community and literature around xenharmonic music helped me find my way of exploring music in a way that comes naturally to me.
Edit: One that’s a little more “energetic” that I always get lost in. The entire album is great, but this track in particular - Homestuck: Medium -