# creates random pronouncable passwords
def self.random_password
  c = %w( b c d f g h j k l m n p qu r s t v w x z ) +
      %w( ch cr fr nd ng nk nt ph pr rd sh sl sp st th tr )
  v = %w( a e i o u y )
  f, r = true, ''
  6.times do
    r << ( f ? c[ rand * c.size ] : v[ rand * v.size ] )
    f = !f
  end
  2.times do
    r << ( rand( 9 ) + 1 ).to_s
  end
  r
end

# creates random pronouncable passwords
def self.random_password
  c = %w( b c d f g h j k l m n p qu r s t v w x z ) +
      %w( ch cr fr nd ng nk nt ph pr rd sh sl sp st th tr )
  v = %w( a e i o u y )
  f, r = true, ''
  6.times do
    r << ( f ? c[ rand * c.size ] : v[ rand * v.size ] )
    f = !f
  end
  2.times do
    r << ( rand( 9 ) + 1 ).to_s
  end
  r
end

Rails random pronouncable passwords

Ruby