FlorianB created World to Hear using an Arduino, an IR distance sensor and a few custom oscillators. He writes:
World to Hear is a device that translates distance into sound. It gives the user the new sense to hear shapes. After a while you start to wonder how your feet may sound.
More at his projects page.
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That ought to be something cool for the blinds. Put it at the end of a stick and you got yourself a super-cane! 🙂