The image I found that I decided to use for tone is an info graphic of the US, showing the obesity levels throughout each state. They use different tones of red and green to represent the different percentages of obese people. Tone in this map works by showing that the most saturated and brightest version of the red represents the largest percentage of obesity. The most saturated and brightest version of the green represents the least percentage of obesity. Then depending on the amount, the tone fades from the red to the green, going from most obese to least obese. This map that uses tone also uses lines. They work together by the white lines separating the different states, being able to separate the tones from each other.
This example is also a good use of color. It's very symbolic for red to mean "bad" and green to mean "good". This graphic uses those colors in that exact way. In this graphic, I would say color works with direction, at least in the top bar or "key" showing the different obesity levels. You could also even say it is a line too, because it uses the change of color, over a line, to direct your eye from left to right.
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