Instead of just having white numbers on your dashboard it gives a cool effect to use 'Conditional colors', which also make the numbers easier to browse through.
You have three options to color your numbers from conditions:
(1) Text color
You set this up when creating/editing a formula. You'll find the conditional colors in the bottom right corner.
Type in the minimum values, and choose between green, yellow and red.
This will format the color, dependent of the value, but only for that specific formula.
(2) Percentage color
Directly on the widget from your dashboard, you can enable 'Use custom conditional colors' to create an automatically condition from the percentages reached.
You have this option on speedometer and number box.
On speedometer and number box both the top number and the speedometer color will change.
You can choose between red, yellow and green but you can customize when to use them.
If you only have one value in the widget the conditional color options will be on numbers. If you have two values the conditional color options are for percentage.
(3) Color box
Instead of just coloring the text, you can on the widget choose to enable 'Use conditional colors as background' which will color the complete box.