[vegardx]

You could, and this is more or less how your computer generates random data currently. It takes in lots of data from the environment that would be hard or almost impossible to predict. But the amount of entropy you get out of that might be too low for your needs, so instead you use it as a seed for a pseudorandom number generator.

On Linux you can just feed /dev/random with whatever data you want, and it will be part of your seed.