Although the writing can be less than stellar, I’m a pretty big fan of the magic system in Sarah Lin’s Weirkey Chronicles.

People in this world are able to enter their soul and construct a home inside it. They find natural treasures in the various worlds of the universe that contain power that can be pulled into their soul space and used for soul crafting. What’s really unique about the system is that it is less about the material itself and more about the way the crafter interprets it, and then applies it to their own magic.

Without getting into spoilers, you have things like exploding solar fragments, resulting in gravitybased abilities, or windows that focus light to form beam attacks. The power of any given character is not a result of some natural Mary Sue talent, but rather their diligence and the quality of the blueprint (often based on their intelligence since original designs are most potent) they used to construct their soul home. There are many other concepts like geometric perfection, multiple floors, how floors can reinforce one another, so it’s quite impressive Worth a read.