When you hit command + opt + G and group a series of clips, it's currently to hard to distinguish that group short of the tiny little text at the top left, that many of us with high res monitors can barely see.
I propose that when you group clips, that group is either colored differently or at the very least has a slightly different (darker or lighter shade) than the rest of the clips on that track.
Example of use in practice.
I edit a lot of voiceovers for training. When I'm going through a large script with paragraphs that need to be numbered and exported as files, I will group clips together that comprise a numbered paragraph before i batch process them. I can barely tell the difference between the clips I've already grouped and what I haven't edited yet. Making the groups a slightly different hue would make that infinitely easier to see.