gistfile1.txt

    var context = [[CPGraphicsContext currentContext] graphicsPort],
        bottomBorderColor = [CPColor colorWithWhite:0.0 alpha:0.6],
        topBorderColor = [CPColor colorWithWhite:1.0 alpha:0.6],
        tintColor = _tintColor || [self backgroundColor],
        bounds = [self bounds];

    CGContextSetFillColor(context, tintColor);
    CGContextFillRect(context, bounds);
 
    CGContextBeginPath(context);
    CGContextAddRect(context, bounds);
    CGContextClosePath(context);

    var hsb = [tintColor hsbComponents],
        hue = hsb[0],
        saturation = hsb[1],
        brightness = hsb[2],
        color1, color2, color3, color4;

    if (brightness < 20)
    {
        color1 = [CPColor colorWithHue:hue saturation:MAX(saturation * 0.4, 0) brightness:MIN(brightness + 30, 100)];
        color2 = [CPColor colorWithHue:hue saturation:MAX(saturation * 0.95, 0)  brightness:MIN(brightness + 2, 100)];
        color3 = tintColor;
        color4 = [CPColor colorWithHue:hue saturation:MIN(saturation * 1.2, 100) brightness:MAX(brightness * 0.98, 0)];
    }
    else
    {
        color1 = [CPColor colorWithHue:hue saturation:MAX(saturation * 0.4, 0) brightness:MIN(brightness * 1.2, 100)];
        color2 = [CPColor colorWithHue:hue saturation:MAX(saturation * 0.95, 0)  brightness:MIN(brightness * 1.02, 100)];
        color3 = tintColor;
        color4 = [CPColor colorWithHue:hue saturation:MIN(saturation * 1.2, 100) brightness:MAX(brightness * 0.98, 0)];
    }

    var gradient = [CPColor newGradientWithColors:[color1, color2, color3, color4] locations:[0.0, 0.5, 0.501, 1.0] count:4];

    CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(0, CGRectGetHeight(bounds)), 0);
    
    CGContextSetFillColor(context, topBorderColor);
    CGContextFillRect(context, CGRectMake(0, 0, CGRectGetWidth(bounds), 1.0));
    
    CGContextSetFillColor(context, bottomBorderColor);
    CGContextFillRect(context, CGRectMake(0, CGRectGetHeight(bounds) - 1.0, CGRectGetWidth(bounds), 1.0));

gistfile2.txt

+ (CGGradientRef)newGradientWithColors:(CPArray)colors locations:(CPArray)locations count:(int)count 
{
    var components = [],
        computedLocations = [],
        offset = 1.0/count,
        colorSpace = CGColorSpaceCreateWithName(kCGColorSpaceGenericRGB);
   
    for (var i=0; i < count; ++i) 
    {
        var color = colors[i],
            rgba = [color components];
        
        components[i*4] = rgba[0];
        components[i*4+1] = rgba[1];
        components[i*4+2] = rgba[2];
        components[i*4+3] = rgba[3];

        computedLocations[count] = offset * i;
        
        if (i>0 && i<count -1)
            computedLocations[count] += 0.01;
    }

    var gradient = CGGradientCreateWithColorComponents(colorSpace, components, locations ? locations : computedLocations, count);

    return gradient;
}