Chrom(ium) has the ability to use the colors from the gtk theme currently used by your desktop. Anyway, sometimes the colors chrome extracts from you gtk theme do not match with the rest of your desktop. To fix this problem you can modify how chrome uses this colors or define complete new colors.
How to do it is described here: http://code.google.com/p/chromium/wiki/LinuxGtkThemeIntegration
You can add that stuff to your ".gtkrc-2.0" file.
I uses this in KDE4 with qtcurve and it works fine.