We've been playing with NiFi 1.0 and of course the new theme/layout is a big change. One thing we don't particularly care for is the bland gray Running/Stopped/Disabled colors. I would be willing to have them bland in the header, but on the Processor/Process Group level I feel they really need to be Green/Red/whatever color.
I would be happy to submit the change, but I wanted to make sure there hadn't been some kind heated discussion over colors or lack thereof before putting in a PR.