The worship of five face of Shiva is widely practiced in Tantra. It is said that many gods and goddesses appeared from the five faces of Shiva. Citing from the Devyagama, the Tantra-rahasya says:
The face in the East (that is in front) is of pearl-like luster with three eyes and crowned by the crescent moon. By this face I (Shiva) revealed (the Devis) Sri Bhuvaneshwari, Triputa, Lalita, Padma, Shulini, Sarasvati, Tvarita, Nitya, Vajraprastarini, Annapurna, Mahalakshmi, Lakshmi, Vagvadini, with all their rites and mantras.
The Southern face is of yellow colour with three eyes. By this face Shiva revealed Prasada Sadashiva, Mahaprasadamantra, Dakshinamurti, Vatuka, Manjughosha, Bhairava, Mritasanjeevani Vidya, Mrityunjaya, with their rites and mantras.
The face in the West (that is at the back) is of the colour of a freshly-formed cloud. By this face Shiva revealed Gopala, Krishna, Narayana, Vasudeva, Narasimha, Vamana, Varaha, Ramachandra, Vishnu, Harihara, Ganesha, Agni,Yama, Surya, Vidhu (Chandra) and other planets, Garuda, Dikpalas, Hanuman and other Suras, their rites and mantras.
The face in the North is blue in colour and with three eyes. By this face, Shiva revealed the Devis, Dakshina Kalika, Mahakali, Guhyakali, Smashana Kalika, Bhadrakali, Ekajata, Ugratara, Taritni, Katyayani, Chhinnamasta, Nila Saraswati, Durga, Jayadurga, Navadurga, Vashuli, Dhumavati, Vishalakshi, Gauri, Bagalamukhi, Pratyangira, Matangi, Mahishamardini, their rites and mantras.
The Upper face is white. By this face Shiva revealed Srimat Tripura Sundari, Tripureshi, Bhairavi, Tripura Bhairavi, Shamshan Bhairavi, Bhuvaneshi Bhairavi, Shatkuta Bhairavi, Annapurna Bhairavi, Panchami, Shodashi, Malini, Valavala, with their rites and mantras.
The sixth face (below) is lustrous of many colours and concealed. It is by this mouth that I spoke of Devatasthana, Asana, Yantra, Mala, Naivedya, Balidana, Sadhana, Purascharana, Mantra Siddhi. It is called Ishanamnaya.
(Source - Sir John Woodroffe: Shakti and Shakta)