Fuel for iWork is a mega template collection for Pages, Keynote and Numbers. The app contains three apps' content: Fuel for Pages, Fuel for Keynote and Fuel for Numbers.
Fuel for Pages is an amazing add-on for Apple's Pages app, with templates in 11 categories. All templates are available un US Letter and A4 sizes, except for envelopes, which come in their specific size. Paper size is selected automatically, depending on your region. Once opened in Pages you can apply your own colors, change fonts, pictures, etc.
Fuel for Keynote features handmade themes for your perfect presentations. Each theme has 32 layouts, so you will always find the perfect slide. Presentation themes come in 2 sizes: Standard and Wide.