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UINavigationBar background from an image
for(UIView *view in self.navigationController.navigationBar.subviews)
{
    if([view isKindOfClass:[UIImageView class]])
    {
        [view removeFromSuperview];
    }
}

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"navBarBG.png"]];
[self.navigationController.navigationBar addSubview:imageView];
[self.navigationController.navigationBar sendSubviewToBack:imageView];
[imageView release];

[self.navigationController.navigationBar setTintColor:[UIColor clearColor]];