http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Creating solid, gradient, or textured backgrounds for PowerPoint 2016 slides
Instead of a theme, you can create your own background for a presentation using colors, gradients, and patterns. This video shows how to choose a color, create a gradient, and create a textured background.
Title from resource description page (viewed May 21, 2018).