Good Evening.
http://wiki.centos.org/ArtWork/MantisThemeDesign?action=AttachFile&do=ge...
Very nice! Much better than the previous header-color combination.
You mean something like the "Reported by Me" format of your Screenshot (http://easys.gnulinux.de/img/Screenshot-119_mm.png) ?
That might also look pretty. However I think it would get you furher away from the Wiki-look. A WikiPage only has one header (dark blue) and several paragraphs (gray header). If there would be one table on the page, it would match again (Screenshot-152). For multiple tables it just could be getting too mixed up.
I agree on that. I guess the light gray background on table headers fits better with the rest of the CentOS world.
Best Regards Marcus