I don't have strong views on the design itself, but I do feel we ought to be
agreed on what badges we actually want to offer. 

In my opinion we need precisely two.

a. "Powered by TEI"

b. "Our TEI technology" 

The first one is for use by anyone who uses any version of TEI anywhere in their
site in any way. 

The second one is a link to a page at which the way the site uses TEI is 
documented. Obviously this could specify whether they use P4 or P5, what their
ODD looks like, and might even give links to some sample P5 files -- but that's
up to the site concerned. Many TEI sites that I know of already have a set of
pages covering some or all of these possibilities so it shouldn't be much extra
work to provide.

We ought to make it attractive for people to sport both buttons, obviously, but
we can't enforce it. Maybe making them fit together visually in some way would
be enough.