daemon.rb

#!/usr/bin/env ruby
require 'daemons'

Daemons.run('leds.rb')

leds.rb

#!/usr/bin/env ruby
require 'pi_piper'

pin_ids = [26, 23, 18, 16, 12]
@pins = []
def fill_pins(pin_ids)
  pin_ids.each do |pin_id|
    temp_pin = PiPiper::Pin.new(:pin => pin_id, :direction => :out)
    temp_pin.off
    @pins << temp_pin
  end
end

fill_pins(pin_ids)

while true do
  pin = @pins.sample
  pin.on
  sleep(1)
  pin.off
end