Well, the best builds for the majority of champions can usually be found in the top 10. For those few champions that you use a unique build, you can make a guide for. There's not much point in publishing a build that's almost the same as others on the site.

Thanks to Hoppermh for the sig!
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Anyway, I would consider making a guide for your top five champs as said above. For instance, of all mine I would probably make a guide for Brand, Rumble, Yi (already done) and Amumu. Other than that, I consider myself mediocre with the champs I own.