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Well, you could check the Tripartite Pack. Learn more about it here but beware, I'm a bit biased
Edit:
You can install it over your ongoing game, it shouldn't hurt at all since it's all graphics and sounds and the only text (.csv) file which changes something (province.csv) isn't activated until you start a new game.
I can second that recommendation - without any bias ay all. It's an extensive, high-quality pack with features not found elsewhere (e.g. sfx) and the fact that CORE is adapting it to their mod will tell you how highly it's regarded.
I'm using all the parts of Tripartite pack that I could insert in CORE. Some stuff is not to my taste but the beuty of it is that you can simply not put in what you don't like so it will stay vanilla or you can find a better replacement. I changed the Japan background with bestmajor's one for example.