Hi Ed,
Gaurav and Dan are correct there isn't a native option at this time to allow you to change those report icons. I am not surprised to hear that there are customers that are interested in being able to make those changes though, as we get many report and visual change requests. While scripting can certainly help you with getting the end result you are looking for if you feel being able to change the report icon�s coloration would be a beneficial feature in Quick Base, I would encourage you to submit feedback regarding this via our Feedback Platform - UserVoice - Which can most easily be accessed from the My Apps page in Quick Base by clicking on the orange Feedback tab or at
http://quickbase.uservoice.com . This forum is used by our development team to explore customer suggestions for enhancements / changes to the platform. This helps us get an idea of the demand for changes to the platform and gives the PD team information on future enhancements. Thank you very much for your time today Ed.