Which is the best way to change the color/view of disclosure indicator accessory view in a table view cell in iOS?

Great post on Cocoanetics that addresses this. The UIControl class inherits the properties selected, enabled and highlighted Custom-Colored Disclosure Indicators

If you're interested in drawing the indicator, instead of using an image file, here's code I worked out to do so:

// (x,y) is the tip of the arrow
CGFloat x = CGRectGetMaxX(self.bounds) - RIGHT_MARGIN;
CGFloat y = CGRectGetMidY(self.bounds);
const CGFloat R = 4.5;
CGContextRef ctxt = UIGraphicsGetCurrentContext();
CGContextMoveToPoint(ctxt, x-R, y-R);
CGContextAddLineToPoint(ctxt, x, y);
CGContextAddLineToPoint(ctxt, x-R, y+R);
CGContextSetLineCap(ctxt, kCGLineCapSquare);
CGContextSetLineJoin(ctxt, kCGLineJoinMiter);
CGContextSetLineWidth(ctxt, 3);
// If the cell is highlighted (blue background) draw in white; otherwise gray
if (CONTROL_IS_HIGHLIGHTED) {
    CGContextSetRGBStrokeColor(ctxt, 1, 1, 1, 1);
} else {
    CGContextSetRGBStrokeColor(ctxt, 0.5, 0.5, 0.5, 1);
}
CGContextStrokePath(ctxt);

If you make a custom UIView subclass, do the above in the drawRect: method, and use that as your accessory view, you'll be able to make the color anything you want.

An accessory view (custom or UIImageView won't be a major performance problem as long as you are properly recycling UITableViewCell instances.

Here is an implementation that works in iOS 8+. It does exactly what's asked for:
change the color of the original Apple disclosure indicator to a custom color.
Use it like this:

#import "UITableViewCell+DisclosureIndicatorColor.h"
// cell is a UITableViewCell
cell.disclosureIndicatorColor = [UIColor redColor]; // custom color
[cell updateDisclosureIndicatorColorToTintColor]; // or use global tint color

UITableViewCell+DisclosureIndicatorColor.h

@interface UITableViewCell (DisclosureIndicatorColor)
@property (nonatomic, strong) UIColor *disclosureIndicatorColor;
- (void)updateDisclosureIndicatorColorToTintColor;
@end

UITableViewCell+DisclosureIndicatorColor.m

@implementation UITableViewCell (DisclosureIndicatorColor)

- (void)updateDisclosureIndicatorColorToTintColor {
    [self setDisclosureIndicatorColor:self.window.tintColor];
}

- (void)setDisclosureIndicatorColor:(UIColor *)color {
    NSAssert(self.accessoryType == UITableViewCellAccessoryDisclosureIndicator,
        @"accessory type needs to be UITableViewCellAccessoryDisclosureIndicator");

    UIButton *arrowButton = [self arrowButton];
    UIImage *image = [arrowButton backgroundImageForState:UIControlStateNormal];
    image = [image imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
    arrowButton.tintColor = color;
    [arrowButton setBackgroundImage:image forState:UIControlStateNormal];
}

- (UIColor *)disclosureIndicatorColor {
    NSAssert(self.accessoryType == UITableViewCellAccessoryDisclosureIndicator, 
        @"accessory type needs to be UITableViewCellAccessoryDisclosureIndicator");

    UIButton *arrowButton = [self arrowButton];
    return arrowButton.tintColor;
}

- (UIButton *)arrowButton {
    for (UIView *view in self.subviews)
        if ([view isKindOfClass:[UIButton class]])
            return (UIButton *)view;
    return nil;
}

@end