Well, thanx so much for this one...Yes, I've changed the color...however, it seems there are at least 4 different files that load different background colors during the entire login process..
1. The first colored background appears just before the graphical login screen is displayed.
2. Next, Once I feed my password and press enter, there are two separate files which load the same background color (blue)....
3. The fourth file is what you have suggested .i.e /usr/bin/startkde..this one loads at the end..so I got the my custom background in this file done...
However, I am yet to figure out which are those 2 files that load the default blue color background..( point no 2) ?
I'd appreciate if anyone can trace these 2 files..