If you want something cool without building yourself,<p>NeuG is an implementation of a true random number generator, a tiny USB 32-bit computer based on a free (as in freedom) hardware design.<p><a href="http:&#x2F;&#x2F;shop.fsf.org&#x2F;product&#x2F;usb&#x2F;" rel="nofollow">http:&#x2F;&#x2F;shop.fsf.org&#x2F;product&#x2F;usb&#x2F;</a>