Yeah, I use a lot of different layer effects like "color" "hue" "saturation" "overlay" "color burn" etc. But yes, you're right, some of the grayscale feeling will always remain if you only use layer effects. That's why I always finish up with a lot of painting in the end. After I'm done using layer effects on grayscale, I'm usually at maybe 40% finish. The rest 60% is through my usual coloring/painting on top.