And there are plenty of Opensource converted themes in zikulathemes.com.
For example in the blueish area:
Deliciously Blue,
Even_Tastier_Blue or
Kubrick (blog theme

)
Why not pick a few from that lot (no licensing issues to sort out
AFAIK) and already converted to Xanthia.
Pick some Blog, Nature, bussiness, simple, very graphic (or what not) themes and pack those.
As much as I like
BlankTheme of course (and the KIS theme listed by Mateo is a fine example

) it should be very clear what license issues there are.
The themes being delivered with Zikula are just not on the same level as Zikula is
IMHO. Just my 0.02?
They are not a showcase of Zikula (again
IMHO). And for example the Demo uses already a much nicer theme (
BlankTheme base

) for showcasing Zikula.
--
campertoday.nl, Module development, Dutch Zikula Community