The whole idea of 'taking on the look of the forums' is intentional, and a feature that many people base their decision on.
If you don't want it to look like the default vbulletin, you make your own style not look like the default vbulletin.
As for your example...how is that any different to
http://www.nzboards.com/photos/browseimages.php?c=511 (Aside from my link giving information about each photo, which can easily be turned off)?