1. Atma Shatakam: The great Adi Shankara (first Shankaracharya) of the eighth century summarized the entirety of Advaita Vedanta (non-dualistic philosophy) in six stanzas. When a young boy of eight, while wandering in the Himalayas , seeking to find his guru, he encountered a sage who asked him, "Who are you?" The boy answered with these stanzas, which are known as "Nirvana Shatakam" or "Atma Shatakam." "Nirvana" is complete equanimity, freedom and joy. "Atma" is the True Self. The sage the Boy was talking to was Swami Govindapada Acharya, who was, indeed, the teacher he was looking for.
2. Bhavani Ashtakam: This is a prayer to mother Divine, Devi Bhavani, composed by Adi Jagadguru Sri Shankaraacarya Bhagvatpada in a high state of devotion and Divine bliss to uplift the consciousness of devotees. This great ashtakam (that which contains 8 verses) is composed by Sri Adi Sankara and it would move any one who reads it to tears. If a great soul like Him, had to desribe himself, thus, Imagine the state of an ignoramus like any one of us.
3. Madurashtakam: Mahaprabhu Srimad Vallabhacharya (1479-1531) is one of the greatest sage-philosophers of India , who belonged to a Telugu family, was one of the foremost followers of Bhakthi Marga and established his philosophy of pushti Marga in North India during the 16th century. Madhurashtakam written by him sees sweetness in his lord inch by inch. Madhurashtakam particulary brings in to focus, Lord Krishna as a child, and glorifies the grace of the child Lord.
4. Shiva Panchaksharam: A Shiva stotra composed by Adi Shankar Ach Arya. This holy stotra to worship Lord Shiva, is made of five litters and is popularly called Panchakshara: "Na Ma Si Va Ya". Each of these the term Shiva means auspicious.