def colour_shade(colour,shade,scale=10)
  # default the scale to 100 if it is greater...
  scale = 100 if scale > 100

  # if the shade is out of the range of scale then reset shade to scale...
  if shade > 0
    shade = scale if shade > scale
  else
    shade = scale * -1 if shade < scale * -1
  end

  colour = "##{colour[1,1]*2}#{colour[2,1]*2}#{colour[3,1]*2}" if colour.length == 4

  # Convert the colours to decimal...
  colour_split = [ (eval "0x#{colour[1,2]}"), (eval "0x#{colour[3,2]}"), (eval "0x#{colour[5,2]}") ]

  # Calculate the shade...
  new_colour = "#"
  colour_split.each do |c|
    case
    when shade < 0: colour_shade = (c - ((c / scale) * shade.abs))
    when shade == 0: colour_shade = (c)
    when shade > 0: colour_shade = (c + (((255 - c) / scale) * shade))
    end
    new_colour << sprintf("0%x", colour_shade.to_i).slice(-2..-1).upcase
  end
  new_colour
end