AES of a counter and a key set from a table based on your CPU serial number also "meets various standards for RNGs and the dieharder tests don't show anything of concern".

And, of course, if you make it the kernel /dev/random you're making it the source of randomness recommended for long term keys and other important things... while you don't know what the users will use it for, you can safely assume it will include some of "the most critical of applications".