In the Breeze, GCal, and PCO platforms, you can specify calendar or tag colors. If you wish, Displaychurch.events (DCE) can use those colors for your events listing.
EXAMPLES
BREEZE
  |
Button toggled on
  |
GCAL
  |
Button toggled on
  |
PCO
  |
Button toggled on
 
|
If you toggle these items off, DCE uses other design items to define the color(s).