Color Labels are a useful way to help group your photos. Very versatile and expandable, Color Labels can compliment almost any workflow. Think: Portraits are Purple, Candids are Cyan (blue), Grins are Green, etc. Color Labels are often the most under-utilized metadata, and arguably the second-most useful label (after Star Rating, of course).
All photos for which a Color Label is applied are shown with a special color background in Photosmith’s Grid View.