If not, use PowerPoint templates. Customize the template in any way by simply editing the master. Make readability a top priority. Select clean, simple fonts. Arial, Tahoma and New Times Roman are the best choices.
Select point sizes that people can easily read.
Reduce the font size if you're doing a Web conference and your visuals are available on a desktop monitor. Limit the amount of text on a slide. Don't use more than six words on one line, and no more than six lines of text on one slide. Go for variety in your slides. Consider charts, diagrams, tables, clip art and sound galleries.