Gratitude in the Qur'an is less a feeling than a practice of attention. "If you are grateful, I will give you more" (14:7). "Remember Me, and I will remember you" (2:152). "If you tried to count God's blessings, you could not number them" (16:18).
The verses here are an invitation to notice what is already present — the ordinary, uncounted things — and to let noticing become a kind of prayer.
14:7 — And remember when your Lord proclaimed: 'If you are grateful, I will surely give you more; but if you deny, my punishment is severe.'
2:152 — So remember me, and I will remember you. Be grateful to me, and do not deny me.
31:12 — And we gave Luqman wisdom: "Be grateful to God. Whoever is grateful is grateful only for his own sake, and whoever denies — God is self-sufficient, worthy of all praise."
16:18 — If you tried to count God's blessings, you could never number them. Indeed, God is forgiving and merciful.
27:40 — The one who had knowledge from the Book said, "I will bring it to you before your glance returns to you." And when Sulayman saw it settled before him, he said, "This is from the bounty of my Lord, to test me — whether I give thanks or am ungrateful. Whoever gives thanks gives thanks only for his own soul, and whoever is ungrateful — my Lord is self-sufficient, generous."
55:13 — So which of your Lord's blessings will the two of you deny?