I've modified the Dialog bar. This is the bar above the dialogscreen you see when, for instance you look at the details of some file in the filemanager.
The original files are I believe 112x56 pix.
The 2 files I made are 800x56

The names of the files are wmDialog.png and wmDialogCenter.png.
The last one you'll only see In the dialogscreen where there's asked for your pincode when starting up and the otherone you see in all the other dialogscreens.
You have to put the files in usr/share/themes/yourtheme/images

I think it works something like this:
N900 "builds up" the dialogbar by taking the wmDialog.png's and repeat those to the width of 800.
So if the width of the .png file is already 800, it does'nt have to be repeated.

edit: This also counts for ToolbarPrimaryBackground.png and ToolbarSecondaryBackground.png. Those are for the basictoolbar you see at the bottom of the screen in apps like the browser, pdf reader, notes etc

It's nothing special, its just that it allows you to add a little variation.


I hope all my BlaBla makes any sence.