The Psychology of Color in PowerPoint Presentations

Blue: The most popular background color for presentation slides

Blue is one of the most common background colors. It's calming and conservative, which is why it's very popular with business presenters, as well as for for trainers. 

Green: Stimulates interaction and puts people at ease

Green stimulates interaction. It's a friendly color that's great for warmth and emotion. 

Red: Handle with Care in Presentations!

Red is one of the most influential colors in your software palette -- but it also carries negative cultural attachments, so use it carefully.

Purple: Mystical and Emotional color in presentations and design

Purple is often associated with royalty and wealth. Purple also represents wisdom and spirituality. Purple does not often occur in nature, it can sometimes appear exotic or artificial.

Yellow, Orange, & Gold: Attention getting colors of affluence and prestige

Yellow can create feelings of frustration and anger. While it is considered a cheerful color, people are more likely to lose their tempers in yellow rooms and babies tend to cry more in yellow rooms.

Black: A strong and definite color that's often overlooked!

Don't forget your basic black. Often overlooked, black is a background color with useful psychological undertones. Its neutrality makes it a good backdrop for financial information.

Grey and Silver: A conservative color; Good when Black or White won't work.

According to psychologists, grey is often thought of as a negative color. It can be the color of evasion and non-commitment since it is neither black nor white.

Source : http://www.presentationteam.com/