Personalizar UIPickerView (fondo y espaciado)

Me gustaría cambiar el fondo blanco en un UIPickerView a una imagen propia.

¿Es posible

Además, he logrado que mi UIPickerView se desplace horizontalmente en lugar de vertical. Ahora, me gustaría saber si hay alguna forma de ajustar el espacio entre dos filas de la vista del selector.

e adjuntado una imagen para mostrar lo que quiero decir.

Este es mi código:

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.

    arrayDays = [[NSMutableArray alloc] init];
    [arrayDays addObject:@"ONSDAG"];
    [arrayDays addObject:@"TORSDAG"];
    [arrayDays addObject:@"FREDAG"];
    [arrayDays addObject:@"LØRDAG"];

    arrayDates = [[NSMutableArray alloc] init];
    [arrayDates addObject:@"29. JUNI"];
    [arrayDates addObject:@"30. JUNI"];
    [arrayDates addObject:@"1. JULI"];
    [arrayDates addObject:@"2. JULI"];

    pickerViewDay = [[UIPickerView alloc] initWithFrame:CGRectZero];
    [pickerViewDay setDelegate:self];
    [pickerViewDay setShowsSelectionIndicator:NO];
    CGAffineTransform rotate = CGAffineTransformMakeRotation(-M_PI/2);
    rotate = CGAffineTransformScale(rotate, 0.25, 2.0);
    [pickerViewDay setTransform:rotate];
    [pickerViewDay setCenter:CGPointMake(self.view.frame.size.width/2, (pickerViewDay.frame.size.height/2)-3)];
    [self.view addSubview:pickerViewDay];

    // Adding selection indicator to pickerview
    UIImage *selectorImage = [UIImage imageNamed:@"DayPickerView_SelectionIndicator.png"];
    UIView *customSelector = [[UIImageView alloc] initWithImage:selectorImage];
    [customSelector setFrame:CGRectMake(0, 0, 120, 74)];
    [customSelector setCenter:CGPointMake(self.view.frame.size.width/2, customSelector.frame.size.height/2)];
    [self.view addSubview:customSelector];
    [customSelector release];

    // Adding background to pickerview
    UIImage *backgroundImage = [UIImage imageNamed:@"DayPickerView_Background.png"];
    UIView *custombackground = [[UIImageView alloc] initWithImage:backgroundImage];
    [custombackground setFrame:CGRectMake(0, 0, 320, 74)];
    // [self.view addSubview:custombackground];
    [custombackground release];
}

- (UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view {
    UIView *viewRow = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 150, 80)];

    CGAffineTransform rotate = CGAffineTransformMakeRotation(3.14/2);
    rotate = CGAffineTransformScale(rotate, 0.25, 2.0);

    // Date
    CGRect rectDate = CGRectMake(30, 0, 150, 80);
    UILabel *date = [[UILabel alloc]initWithFrame:rectDate];
    [date setTransform:rotate];
    [date setText:[arrayDates objectAtIndex:row]];
    [date setFont:[UIFont fontWithName:@"Arial-BoldMT" size:37.0]];
    [date setShadowColor:[UIColor whiteColor]];
    [date setShadowOffset:CGSizeMake(0, -1)];
    [date setTextAlignment:UITextAlignmentCenter];
    [date setBackgroundColor:[UIColor clearColor]];
    [date setClipsToBounds:YES];
    [viewRow addSubview:date];

    // Day
    CGRect rectDay = CGRectMake(-30, 0, 150, 80);
    UILabel *day = [[UILabel alloc]initWithFrame:rectDay];
    [day setTransform:rotate];
    [day setText:[arrayDays objectAtIndex:row]];
    [day setFont:[UIFont fontWithName:@"Arial-BoldMT" size:21.0]];
    [day setTextColor:[UIColor colorWithRed:0.35 green:0.35 blue:0.35 alpha:1]];
    [day setTextAlignment:UITextAlignmentCenter];
    [day setBackgroundColor:[UIColor clearColor]];
    [day setClipsToBounds:YES];
    [viewRow addSubview:day];

    return viewRow;
}

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [arrayDays objectAtIndex:row];
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
    return [arrayDays count];
}

EDIT 1

Para RickiG (en el fondo):

EDIT 2

Para RickiG: