Always a dark blue in Kmail colours with KDE colour scheme

Hi,

I always have a dark blue colour for some of the folders in KMail not
depending on the colour scheme of KDE. Even if I choose a KDE colour
scheme with no blue at all (at least what Ksettings says), I get it.
There are also other applications like digikam with this colour.

Here some examples:
http://yfrog.com/jcsnapshot1kmailj
http://yfrog.com/jnsnapshot2kmailj

Do you know where I can disable/change that? I don't like it on dark
colours? I use the most recent stable KDE SC (4.3.4).

Cheers
Sebastian