well, I think I know what you mean.
I guess you mean rules which produce a “proper” or “commercial” result. for example photography, there are certain rules if you want a “clean” result, for example you need to pick the right film, choose a correct lens, the correct point from where you take the picture, how wide the lid is opened and how long (I dont know the english terms for this stuff, sorry).
now, changing those rules or ignoring them leads to creativity, for example, polaroid pictures look awful from a certain point of view, they are too bright, they have a nasty color-shift, but then exactly this can lead to something we call “art”. but, as I said, it only could lead to something creative, as most of the time it will simply be a “bad picture”.
as with movies, watch for example “adaptation” from spike jonze with nicolas cage, its basically a movie they made for charlie kaufmann, because he wrote a script about himself and the problems to be a script-writer in hollywood. there are some great scenes in there, for example where he is sitting in a writing-seminar, his voice in the off telling us what he thinks about, but then it suddenly gets cut off because the teacher infront of the class yells “and I dare you, never use a voice from the off to tell people what your main-character thinks of, because its cheesy and sucks”. great movie and you might learn something from there 
I think everyone has its own rules or preferences he follows while doing something or which make him go puke or cheer in joy when consuming something
For example, a few of the things I tend to follow or which make me to like/dislike music :
I hate it if drums dont follow the groove of the rest of the song. if someone makes music with samples like piano, bass and so on and creates a certain rhythm with those and then just puts a drumloop over it which does not at all play the same groove with the basedrum/snare/hihat combinations, I go puke. I hate that and I spend alot of time arranging my drums.
Also, I dont like uninspired/non-thought-of melodies. There are certain kinds of electronic music aswell as some freejazz stuff which is just way too chaotic for me. (especially with the jazz stuff I get kinda disconnected from the music if someone plays a solo where he seems to try to play as much notes as fast as possible, without any apparent connection to the rest of the music going on).
however, there are people who may like exactly that.
and so, if you look at it closer and closer, all those “rules” finally crumble apart, because they might not be important at all if you do something special. (For example, I could say “well, atleast try to mix your song right”, but then again … there are tracks which sound great because the lower frequencies of the basedrum and the bass-sound modulate each other, altough normally you try to avoid that at any cost, and there is so much lo-fi music out there which is just great the way it is, awkwardly sounding).
so I guess the only rule I can think of is that creativity is the bending or ignoring of rules and guidelines, but bending or ignoring guidelines does not automatically lead to creative or good results, mostly it leads to crap.
just because you bend rules doesnt make you creative, you still need to know what you do.
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All right, classical music is not your thing, but boring – it is not.