Here is how I generated my image...

gistfile1.txt

require 'RMagick'
include Magick

img = Image.new(1000,1000)

def fib_arr(num)
  return [1] if num == 1
  return [1,1] if num == 2
  nums = fib_arr(num-1)
  return nums + [nums[-1] + nums[-2]]
end

fib_nums = fib_arr(3000)

def z(x, y, fib_nums)
  y*fib_nums[x] % MaxRGB
end

1000.times do |y|
  1000.times do |x|
    r = z(x*3,y, fib_nums)
    g = z(x*3+1,y, fib_nums)
    b = z(x*3+2,y, fib_nums)
#    puts "#{x}, #{y}: r #{r} g #{g} b #{b}"
    p = Pixel.new(r, g, b, 0)
#    p "#{p}"
    img.pixel_color(y, x, p)
#    p "#{img.pixel_color(x,y)}"
  end
#  img.display if y % 50 == 0
end

img.display