That looks cool - one of the best. Is it on the Wiki?
Have you considered using the grayscale options - your background and icons could be level 2, making the text stand out more (though I think you have to make them from multiple bitmaps, because grayscale can't go in the background). Don't know that the progress bar can be anything but black though.
It'll be nice when we can have multiple fonts and different grays in the text...
It probably wouldn't really suit the aesthetic of your WPS, but I rate the Helvetica fonts. They're very narrow but still very readable, so you get more in the width of the screen.