An enjoyable stroll through the rainbow

[megazear7]

colors = [ [255, 0, 0], [255, 127, 0], 
[255, 255, 0], [0, 255, 0], [0, 0, 255], 
[75, 0, 255], [143,0, 255] ].each_with_position do |step, position|
 next = colors[position+1]
 red = step[0]
 red_next = next[0]
 green = step[1]
 green_next = next[1]
 blue = step[2]
 blue_next = next[2]
 rdelta = red_next - red
 gdelta = green_next - green
 bdelta = blue_next - blue
 (num_of_tests / 6).each do |single_test|
   r = red + rdelta
   g = green + gdelta
   b = blue + bdelta
   # rgb are your colors for this test
  end
end

This creates a single rainbow of colors over all your tests instead of repeating the rainbow.