How one's sordid past comes back ....
I did a random light flasher using the amplified noise from a Zener diode and stuffing it into the Analogue ( Analog for those in the USA who can't be bothered to spell it properly

) input on a PIC. Cramped the output value into 3 bits to give 8 outputs, ( there is a CMOS chip ie. a 3-line to 8-line decoder).
Not much use to you if you want to do Arduino or Raspberry Pi though. The code was in MikroC or Hi-Tech C . to a 16F886 PIC.
Worked rather well to my surprise.
I think I may still have the circuit somewhere but not sure, simple enough though.
Will have a look if you're that desperate ..
Dave BC
Edit ... 74HC238 chip