You could paint the walls and ceilings the same colour so they blend together.

你可以把这些墙和天花板漆成相同的颜色，这样它们就浑然一体。

《柯林斯英汉双解大词典》

Confident in its camouflage, being the same colour as the rocks, the lizard stands still when it feels danger.

蜥蜴对自己和石头颜色相同的保护色很自信，即便感觉危险也不动。

《柯林斯英汉双解大词典》

They (the eyes) were the same colour as the sea, cheerful and undefeated.

那双眼啊，象海水一样的颜色，愉快，毫不沮丧。

youdao

The head is covered with a cap of the same colour as the tunic.

UNESCO: Culture

It states that any planar map (that is to say, a flat one) can be coloured with at most four colours in a way that no two regions with the same colour share a border.

ECONOMIST: Just what does it mean to prove something?

Are they all the same colour?

BBC: More moons for Jupiter