Text if you re using text, remember the 6x6x6 rule. No more than six words per line, six lines per page or six text slides in a row. Color if at all possible, use corporate colors in your presentation. If you re starting from scratch, pick one or two colors and restrict your color use to tints and hues of these two shades. For example, if you pick red and brown, you can use pink, burgundy, orange and beige.
Fonts keep it consistent.
Use no more than two fonts, and make sure you use them throughout your presentation including graphs and photo captions. Keywords use key words and phrases rather than complete sentences. It will eliminate a lot of clutter on your slides. Of course any presentation needs quality content to make sure it s a success. You can t save a weak presentation with great visuals, but you could dilute the impact of an excellent presentation if you ignore the appearance of your slides.