Thought this might be a useful resource for some. I pulled the hex codes that the a Calendar Report generates and consolidated them into the attached document.
Out of the box color options are pretty limited within Workfront, but the Calendar Report definitely has the most options with 15 options (if you consider white to be a color.)
I'm using these to build my calendars and then I use the hex-codes in my other related project/task report's conditional formatting to keep continuity between all reports. ^I've attached this as a PDF as well Satchell Mische-Richter Quality Bicycle Products