Basically UIPageControl has an _indicators array that contains UIViews for each of the dots. This array is a private property, so you should not mess with it. If you need custom icons, you will have to do your own page indicator implementation.

Edit: After some more research, it seems you can replace the UIPageControl subviews to customize the dot images. Check http://www.onidev.com/2009/12/02/customisable-uipagecontrol/ for details. Still not sure how Apple reviewers are going to feel about doing such thing though.

I created an UIPageControl subclass to achieve this easily and legally (without private APIs). Basically, I overwritten setNumberOfPages: insert a UIImageView with he icon inside of the last circle. Then on the setCurrentPage: method I detect if the last page gets highlighted or not, to modify the UIImageView s state and also, clear the background color of the circle since this will be updated automatically by UIPageControl private APIs.

This is the result:

This is the code:

@interface EPCPageControl : UIPageControl
@property (nonatomic) UIImage *lastPageImage;
@end

@implementation EPCPageControl

- (void)setNumberOfPages:(NSInteger)pages
{
    [super setNumberOfPages:pages];

    if (pages > 0) {

        UIView *indicator = [self.subviews lastObject];
        indicator.backgroundColor = [UIColor clearColor];

        if (indicator.subviews.count == 0) {

            UIImageView *icon = [[UIImageView alloc] initWithImage:self.lastPageImage];
            icon.alpha = 0.5;
            icon.tag = 99;

            [indicator addSubview:icon];
        }
    }
}

- (void)setCurrentPage:(NSInteger)page
{
    [super setCurrentPage:page];

    if (self.numberOfPages > 1 && self.lastPageImage) {

        UIView *indicator = [self.subviews lastObject];
        indicator.backgroundColor = [UIColor clearColor];

        UIImageView *icon = (UIImageView *)[indicator viewWithTag:99];
        icon.alpha = (page > 1 && page == self.numberOfPages-1) ? 1.0 : 0.5;
    }
}