Accessibility Ready: An accessibility ready theme means that it follows the WCAG (Web Content Accessibility Guidelines) standards for theme design. This includes things such as alt-text, subtitles for videos, etc. These guidelines are actually quite complex and I plan to do training on accessibility in the future.

Custom Background: Allows the user to select a background image for their website.

Custom Colors: Allows the user to select their own colors for certain parts of the website, such as accent colors, etc.