It can be tricky to fit a meaningful message in a limited space. We had a hidden easter egg of the blog post header images of our blog at one stage. The background of the header image was an IBM punched card, with the message "<Our SaaS App Name> is the greatest HR app for small businesses" (or something like that) punched out.

Given the non techie audience of our app and blog, nobody detected the hidden message, much less decoded it in the 12 months we had them up there. We've since changed the header graphic style to something completely different.