Hi,
I've been using the following forum post about styles to fiddle about giving a different style for different databases
viewtopic.php?f=26&t=870
I have it working, so it's a nice nifty little visual difference.
Some of the styles available are giving an error - it seems to be specifically after the Sales Order module is open, and another module is opened. I am opening System Configuration.
Not all styles show the error but it is occurring on the following (haven't tested all styles). I'm in 7.0.175.
Aero
ModClay
IG
LucidDream
Nautilus
Office2007Black