>>>++[
    <++++++++[
        <[<++>-]>>[>>]+>>+[
            -[->>+<<<[<[<<]<+>]>[>[>>]]]
            <[>>[-]]>[>[-<<]>[<+<]]+<<
        ]<[>+<-]>>-
    ]<.[-]>>
]
"Random" byte generator using the Rule 30 automaton.
Doesn't terminate; you will have to kill it.
To get x bytes you need 32x+4 cells.
Turn off any newline translation!
Daniel B Cristofani (cristofdathevanetdotcom)
http://www.hevanet.com/cristofd/brainfuck/