This would be a great thing but with copyright I can see why it would be an issue. Wouldn't it be cool to pay an extra fee and be able to legally design your own artwork? I'm sure it cost money to personalize each persons request but what would the real difference be compared to say those MOD-DVD releases that are made when you purchase? Have a database with artwork to choose from and letting the customer design their own case seems like a cool way to make a profit plus please the customer.
I know it's just wishful thinking though.