Maybe it's because I've been reading lots of Jane Austen and Shakespeare that I noticed this, but Fitzgerald used a lot of color words in Gatsby, and comparatively, Austen and Shakespeare use barely any color words. The two that stood out to me the most were white and blue. The nouns paired with white seemed more realistic than those that were paired with blue.
Things that are white- palaces, mansion, windows, dresses, race, girlhood, railroad fence, dust, feet, sheep, complexion, spot, shirt front, flannels, etc.
Things that are blue- honey of the Mediterranean, gardens, uniform, coat, nose, limit of the sky, coupe, leaves, smoke, lawn , etc
In reading this novel, it seems that blue is associated with more abstract objects, whereas white is more tangible? That might be a bit of a stretch.
I also noticed the color green, specifically the green light at the end of the dock at Daisy’s house. It’s mentioned at the end of chapter one. Gatsby looks to this light and later in chapter 5, he mentions it again. This light possibly represents Gatsby’s confidence and/or optimism that he will win over Daisy?