Possibility of some CM stuff?

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http://forum.xda-developers.com – Well, if I understand this bootloader situation enough, we can't edit .kdz files because they are encrypted. Thus disabling us from flashing CM stuff. However, if we can't edit stuff before we flash, is it possible to edit stuff after we flash? For example, mini stuff like these CM10 boot screen CM10 launcher CM10 apps? (Messaging, Contacts) CM10 Themes? Other CM10 stuff? I was thinking, are we able to "push" stuff into the system though adb or cwm? All the small things matter right? I would certainly like a CM10 bootscreen and shutdown screen, over the stock laggy LG sh*t I' (HowTos)