Set the default UINavigationBar background image (and baseColor) app wide. Needs the @2x as well.

defaultuinavigationbarimage.m

// For .h file - (void) customizeAppearance; and @property (nonatomic, retain) UIColor *baseColor;

// For .m file.
- (void) customizeAppearance
{
    _baseColor = [[UIColor alloc] initWithCIColor:[CIColor colorWithRed:0.157
                                                                  green:0.169
                                                                   blue:0.235
                                                                  alpha:1.0]];
    
    #warning Use the code below to set the global background color in IOS5+
    //[[UIView appearance] setBackgroundColor:_baseColor];
    
    UIImage *tileImage = [UIImage imageNamed:@"inner-header-large.png"];
    [[UINavigationBar appearance] setBackgroundImage:tileImage forBarMetrics:UIBarMetricsDefault];
    
    
}