Going by that, even skinning your browser or adding a wallpaper will be called "customization". For people who do not change their computers that often, it is okay to customize to make your screen look prettier. I myself use 2 diff OS on 3 machines regularly, so not much customizations for me :(
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As a counter argument to this, consider this blog post, called "Living with defaults": http://www.oreillynet.com/mac/blog/2007/10/living_with_defau...
Going by that, even skinning your browser or adding a wallpaper will be called "customization". For people who do not change their computers that often, it is okay to customize to make your screen look prettier. I myself use 2 diff OS on 3 machines regularly, so not much customizations for me :(