>>++>+<[
    [>>]+>>+[
        -[++++++[>+++++++>+<<-]>-.>[<------>-]++<<]
        <[>>[-]]>[>[-<<]+<[<+<]]+<<
    ]>>
]
"Random" bit generator using the Rule 30 automaton.
To get x bits you need 4x+4 cells.
Daniel B. Cristofani (cristofd@hevanet.com)