I want my window's background to be yellow

gistfile1.m

//Why you'd want to do that, I don't know,
//but someone asked me how to turn the window background yellow.
//Since the window has a contentView NSView in it,
//this adds a category on it that draws the background with a transparent yellow.
//You also get the pinstripe effects. Just put this code anywhere.
@implementation NSView (BWYellowView)

- (void) drawRect: (NSRect) rect
{
    NSColor *transparentYellow;

    rect = [self bounds];

    transparentYellow = [NSColor colorWithCalibratedRed: 1.0
                                 green: 1.0
                                 blue: 0.0
                                 alpha: 0.333];
    [transparentYellow set];
    [NSBezierPath fillRect: rect];

} // rect

@end // BWYellowView
//I have no idea how you colorize the titlebar.