How can I customize the accessory disclosure image in a UITableViewCell?

You'll need to create a custom view and assign it to the accessoryView property of the UITableViewCell object. Something like:

myCell.accessoryView = [[ UIImageView alloc ] 
                       initWithImage:[UIImage imageNamed:@"Something" ]];

- (UITableViewCell *)tableView:(UITableView *)tView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    UIImage *indicatorImage = [UIImage imageNamed:@"Arrow.png"];
    cell.accessoryView =[[[UIImageView alloc]  initWithImage:indicatorImage] autorelease];


    return cell;
}

well i do this with the help code given above

I ran into the same problem as Greg--the accessory view doesn't track (if you use an UIImageView)

I solved it like this:

UIImage * image = [ UIImage imageNamed:@"disclosure-button-grey.png" ] ;
UIControl * c = [ [ UIControl alloc ] initWithFrame:(CGRect){ CGPointZero, image.size } ] ;

c.layer.contents = (id)image.CGImage ;
[ c addTarget:self action:@selector( accessoryTapped: ) forControlEvents:UIControlEventTouchUpInside ] ;
cell.accessoryView = c ;
[ c release ] ;