There are enough iPod docks in the world for you to choose one that no one you know will own. But if you want one that you can virtually guarantee will be a one-of-one, you should take a look at RockAppleWood. Using "local reclaimed, fallen, or re-purposed wood", the team behind RockAppleWood carves beautiful audio docks by hand that work with Apple's line of iOS devices. The prices and configurations range from $60 for one that supports one iPhone or iPod to $600 for one that supports an iPad and an iPhone or iPod. And because they're all handmade, no two will ever be exactly the same.
Check out the RockAppleWood Etsy shop for more details.