Hazel 3.2 still has the options related to color labels although Mavericks seems to have gotten rid of this notion. I use this in some of my rules. One of my rules labels icons on the desktop related to their age.

Not as useful as before because now Apple is using an inconspicuous dot rather than a colored label. In addition, however, this does not appear to be working completely. Still makes new files green as per my rules but older icons not turning red, as per other rules, after they have been on the desktop for a number of days.