As I wrote once, “The whole universe is the temple and we all are the idols in it.”
Here is what Ramana Maharshi wrote in Upadesa Saram:
जगत ईशधी युक्तसेवनम् ।
अष्टमूर्तिभृद्देवपूजनम् ॥ ५ ॥
jagata īśadhī yukta sevanaṃ
aśṭa-mūrti bhṛd deva-pūjanam ॥ 5 ॥
Ether, fire, air, water, earth,
Sun, moon and living beings
Worship of these,
Regarded all as forms of His,
Is perfect worship of the Lord.
Know Thyself 