> Could you perhaps send several examples with a sample of sans-sérif
> that you have?  :-)

I've attached the file.  The one on the left is the current version with
"more pastel colors."  This is my favorite version because (1) the
typeface is clean and (2) the contrast between the drops and the word
isn't sharp (that's what I meant by "too thin").

Also, the other versions require some (tiny) adjustments.  So if you
decide to use a different version, it'll be necessary to check some
issues.

> GPL + GFDL (but I’m the one who made that choice) :

>   http://www.gnu.org/software/guile/graphics/

> I think it covers all our practical use cases, and there’s not much at
> stake anyway.  WDYT?

I agree, but I'd prefer to ask the FSF people anyway.