(taken from KeePass site)
These images were quite popular on websites around the early 00's, from as far back as I can remember. They seemed to phase out with the introduction of flat and material website designs. They were often used to demonstrate the capabilities of the site (XHTML-compliant, CSS3, etc), and then longer strip variants were commonly used in signatures for bulletin boards.
They had a simple elegance about them, consisting of a small logo, a simple common font, a white background outlined by a thin black border and a further inset background colour to compliment the font. These aspects lead me to think they might have been generated, in which case does anyone know what they were named?