Customizing the segmented control to be dark gray and green when selected. Note: this is not a subclass - just set it in your controller.

KCSegmentedControl

// in viewDidLoad
[self.mySegmentedConrol setTintColor:[UIColor colorWithRed:153.0/255.0 green:153.0/255.0 blue:153.0/255.0 alpha:1]];
[self.mySegmentedConrol setSegmentedControlStyle:UISegmentedControlStyleBar];

// Update tints on valueChanged
- (IBAction)valueChanged:(UISegmentedControl *)sender {

  UIColor *selectedTintColor = [UIColor colorWithRed:80.0f/255.0f green:185.0f/255.0f blue:72.0f/255.0f alpha:1.0];
  UIColor *unselectedTintColor = [UIColor colorWithRed:153.0/255.0 green:153.0/255.0 blue:153.0/255.0 alpha:1];

  for (id subview in [sender subviews]) {
      if ([subview isSelected]) 
         [subview setTintColor:selectedTintColor]; 
      else
         [subview setTintColor:unselectedTintColor]; 
  }
}