Hi @Laura
i am late to answer (sorry) and a bit humble concerning your question as there might be many better and scientifically proven results concerning the three main trains of visual impairment relating to colorblindness.
But as you asked and i like to give my personal opinion (even if it might be rather shallow) … i am fond of the (former?) default setup of Jenkins … they work with Blue / Yellow / Red as Job-Status-Indicators i guess.
In my experience i was able to work rather good with these main colors.
cheers
Daniel
P.S.: I noticed with delight that there are some colorblind improvements mentioned in @ganncamp s Announcement for SQ 7.6 here