Use a different Fail color instead of default gray

[herrbrixter]

Gray is a very neutral color and it is just slightly different from another color. ex: "Gray vs Blue".

Also the skipped / no entry is also a neutral color and is almost similar. ex: "Gray vs Dark Gray".

I'd like to change the default Fail color of Gray to another color to make it contrast with a Success value. ex: "Green vs Blue". Green for Fail and Blue for Success.

"Green vs Blue" is visually more contrasting than "Gray vs Blue".