I just thought it looked random.
Perhaps color will play more a role in grammar down the road now that we read electronically more than on paper...
I've never seen that for quotes though. It may work but you may want to do something simpler and easier to understand--like indenting and perhaps itallicize/resize.
I do it because its easier to read quotes than put it in a quote box, I find. I borrowed the idea form someone on this forum. If it doesn't help, I'll just stop doing it. Sometimes putting it in a quote box hides the full quote and people have to click more to reveal.
-Peli
It's basically what the quote boxes are doing. And it's been 20 years since I was in grammar school but I think indenting is technically the correct way to handle longer quotes if you aren't quoting inline with quotation marks.
Rules should be tested and redefined when there is a better way. And forums are hardly the place to be grammar police. I see errors up and down my own posts all the time (this one included).
It just wasnt clear to me what you were doing.