[color=Blue]i think case modding has it´s roots in overclocking.
some years ago, not more than3 or 4 , people startet to add fans to their cases to get better cooling performance for overclocking. when computers became more common, some people came up with the thought that they didnßt like having the same stuff as anyone else and so painting started. nowadays modding also means to get more comfort and add some custom features to a case such as leading a headphone jack or the nic leds to the front panel for better access. so modding is nothing more than modifing a case to fit you personal needs and piss other people off by having a much more bad-assed machine than them ;D