So, if anyone wants to put a Debian Swirl in there, I'm happy to include
it. And since I can already confirm that the logo shows in the selection
menu of my iBook G4 when booting the rescue CD from [3], we can be sure
the Debian Swirl would work, too.
That would be nice! If there's a need for additional examples, the
powerpc installer ISO from 2019-04-20 for example contains a Tux logo in
`/install/ofboot.b`.
BTW, I find it very cool, how much of the actual - let's say rendered -
picture is already recognizable in the "ASCII" version, both for the GNU
logo and the Tux logo. I wonder if the logos shown on the glass console
by SPARCstations and later SPARC machines are not created the same way.