This is an idea I just came up with which is very simple and I haven't heard it anywhere else. First off, I believe there is nothing but God and God is a mind (idealism).
If God is omniscient, possessing infinite wisdom, he cannot learn or experience something new, and thus his supposed state of perfection is forever lacking the experience of novelty.
For this reason I believe God is a mind which is finite in wisdom but ever increasing. I mentioned this idea in a different thread but I didn't explicitly state and have good reasoning for why I believe God isn't changeless or perfect. It's a never-ending, ever-unfolding story, not a closed book.