At Gatsby's party, Nick meets "Two girls in twin yellow dresses, who stopped at the foot of the steps" (Fitzgerald 42). Anybody who attends Gatsby's huge parties every weekend is looking for an escape from reality. The color yellow symbolizes materialism.
In the Valley of Ashes there is a billboard’ The eyes are blue and gigantic... a pair of enormous yellow spectacles” (Fitzgerald 23). Money is circulating everything he sees because the Valley of Ashes is known as a wasteland.
Gatsby’s wealth allowed him to have anything he wanted, for example his car “Was a rich cream color bright with nickel...there in its monstrous length” (Fitzgerald 64). His car is yellow but is very close to gold, which represents wealth and riches.