High contrast visualisation color palette

**Environment**: - Grafana version: v6.2 I received this request from one of my internal team members, where we use Grafana. ``` I was looking at grafana dashboards recently and having a lot of difficulty reading the graphs because I have a mild form of red / green color blindness (deuteranomaly, rather than deuteranopia). Basically, when I look at the graphs, all the lines look the same. If it’s not much trouble, for a future update, would you consider adding the option to change the colors? If you don’t want to add a whole color choosing option, there’s a short set of rules you can use to choose color palettes for people with color problems. I think I can remember them pretty well: 1. Make palettes available that are: a. Blue or violet alongside red, with yellow or a bright orange b. Red alongside green (which you already have, for a rare form of color blindness) 2. Use different saturations and brightnesses for different data. This lets users with even complete color blindness to distinguish differences between the data based on color value. 3. Using patterns is helpful if that’s an option. Thanks for considering my request! ``` Can we have grafana theme that make lives of people easier while using grafana? I am not an expert and this field, but I can certainly arrange with some of the people I know to contribute to this topic with information about, what will be helpful to build this. Like what color and pattern strategy can be helpful. I certainly see that series color can be customized, but how to set default series colors that will work for these scenarios?