3 sentences

1. 秋天的树叶变成了金黄色。

   qiū​tiān de shù​yè biàn​chéng le jīn​huáng​sè.

   The autumn leaves have turned golden yellow.

   Source: Dong Chinese Dictionary

2. 田野里到处都是成熟的金黄色谷子。

   tián​yě lǐ dào​chù dōu shì chéng​shú de jīn​huáng​sè gǔ zi.

   The fields are filled with ripe, golden millet.

   Source: Dong Chinese Dictionary

3. 院子里种着的向日葵长得很高，金黄色的花盘非常漂亮。

   yuàn​zi lǐ zhòng zhe de xiàng​rì​kuí zhǎng de hěn gāo, jīn​huáng​sè de huā​pán fēi​cháng piào​liang.

   The sunflowers in the courtyard have grown very tall, and their golden heads are beautiful.

   Source: Dong Chinese Dictionary