Subject + 蓝
蓝 (lán) can function as a noun referring to the color blue itself. In literary contexts, it evokes imagery of sky and water. For example, 江水蓝 means "the river water is blue."
她穿了一件很好看的蓝。
tā chuān le yí jiàn hěn hǎokàn de lán.
She wore a very nice-looking blue outfit.
天空的蓝让人心情舒畅。
tiānkōng de lán ràng rén xīnqíng shūchàng.
The blue of the sky makes one feel relaxed and happy.
我最喜欢大海的那种蓝。
wǒ zuì xǐhuān dàhǎi de nà zhǒng lán.
I like the blue of the ocean the most.