36 million people worldwide are blind. So when we are talking about being welcoming and inclusionary in our work places, in our spiritual spaces, and in our marketing, we are doing a huge disservice to a large number of folks if we send out an email that is all graphics.
Yes, You Need a Style Guide
What is a style guide? A style guide is a document that outlines how your organization should look or be credited in print, web, or other media. I can't tell you what to do, but if I COULD I'd tell you to invest a few dollars or a couple of hours to clarify your organization's voice.