If talk is more than 30 minutes, provide a break for audience. As you select color backgrounds or create your own, keep in mind color relationships. Complementary colors are opposite each other on the color wheel, like orange and blue. If you use complementary colors on a page, like a blue background with orange text, the colors when placed next to each other are the most dynamic, but can be visually overwhelming. Consider using color as an organizational tool, to help the audience see key parts of the slide based on color.
Colors convey moods.
Warm colors, such as yellow, orange, and red, provide pleasant if not dynamic reactions. Cool colors, such as green or blue, evoke a quiet mood and are less outgoing than warm colors. Avoid red-green combinations, because this is a common type of color blindness, especially among men. Comments on Text and Typeface Try to keep text short. Search for one word that will do for two.