It would be nice to be able to select the colors on the lines in the history graph card or the map card with history enabled.
Example:
It would be much easier to identify the rooms if I could choose a color for each room.
For instance I know my son would pick orange or black as his color. My daughter would choose rainbow colored with unicorns running on the lines (but I guess that is too much to ask…?)
The same thing on the map card.
I agree this is great example of WTH but at the same time I think this might be a broader issue, the same applies to calendars colours too.
Aye what we need is a visual theme editor. But… I ag
At least this is possible currently by card-mod.
Hi.
Good idea that I would like to support with my vote 
The fact that there are now several (6) current WTH topics specifically dealing with suggestions and good ideas for improvements to the history graph, shows that it is effectively time to bring out something new and more performant.
I have also created a WTH topic to this theme:
And here are another 4 actual WTH topics on the same theme:
So, vote diligently and hope for a new history graph
