If you visit most print sites, to purchase things such as business cards or leaflets, you'll notice the pricing is calculated dynamically based on things such as , how many you have selected, the thickness of the card, the size, double sided, number of colours and so on.

Although Magneto does have custom options & attributes, out of the box these don't quite allow a store owner to achive this dynamic style pricing. To make it possible requires a half decent amount of effort.

We have just finished writing a modification for a customer to address just this problem.
We will be adding a few more features to it before we release it onto Magento connect as an extension.