These guys stock a really good range of housings, pre-crimped ready-made wires of many lengths(second link), and a crimp tool if you want to make your own.
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Using the pre-crimped wires makes it really easy to make custom cables in just seconds. Just snap the pins/sockets into the housings in whatever arrangement you choose.
And a really neat end product.
Not the cheapest option, but definitely the easiest and the most elegant.