Using Color in Ad Design
Since green is the color of money, it is shorthand for prosperity. When not relying on blue or gray, financial institutions, banks and accountants often use green for just this reason.
A negative connotation of green is envy or jealousy.
Orange is a blend of yellow and red, and conveys many of the meanings of these colors: food, brightness and warning. It has connotations of energy and flamboyance. It's less intense or aggressive than red but can be used in a similar fashion to grab attention and highlight important areas of a design.
Orange also signifies autumn, as it's the color of autumn leaves and of pumpkins, which ripen during the season. When fall rolls around, requests for designs featuring orange spike tremendously, even when they aren't referencing Halloween!
You can use orange as a foreground color to highlight important elements or as a main background color to convey feelings of enthusiasm, vibrancy and warmth. Without screaming, orange makes a big statement. Because orange is also a citrus color, it can conjure up thoughts of vitamin C, freshness and good health.
There don't seem to be standard industries that rely on orange (although it is very popular among sports teams). Rather, it seems that companies who want to break the mold and stand out in a crowded field tend to use it, such as Home Depot and FedEx (which combines it with purple).
Purple was originally the color of royalty, and still conveys luxury and expense. Purple is a rich, striking color and conveys warmth and depth.
Bright purples are best used to promote children's items, as it is the most preferred color of kids. Deep purples are often used on religious sites or those wanting to make a powerful yet firm statement.