Error Pages - Can I Customize Them Easliy

["Vadim Pushkin" <wiskbroom@xxxxxxxxxxx>]

Hello;

I pretty much have only English and Russian language defined for my local 
users and would like to customize my error pages to show our school colors, 
logo if possible, and some other help and contact info.

Has anyone done this?  If so, would you mind either sharing your notes or 
your modified error pages?

Thanks,

.vp