That's when you can turn to other designers, who have created original Keynote themes for sale. Once purchased and installed----some are even free----these new themes appear in the Theme Chooser alongside Apple's offerings. Each brings new designs, animations, and templates to use as-is, or to customize. This brief guide will help you find new Keynote themes for your next presentation.

offers 24 attractive, business-oriented themes. Most have more than a dozen master slides, and many sport patterns that connect with other slides across transitions to give the illusion of one continuous design. Most themes are available in standard 4:3 resolution, but one, Spotlight, is also available in a widescreen high definition format. The site also offers, for additional charge, supplemental graphics such as national elements, curtain animations, and extra master slides for some themes.

Prices: Individual themes, $20; sets of three, $40; two collections of 12 themes, $100 each.