In the creation section of the Rudra Samhita the order of the Vaishnava story is reversed. Shiva is first and alone; wishing for the world, he produces Vishnu from the left half of his body and Brahma from the right, the latter by way of the lotus. He then assigns them their offices, keeping dissolution for himself as Rudra. The account thus grants Brahma his familiar lotus birth while making Shiva, not Vishnu, its cause.
Shiva Purana, Rudra Samhita, Srishti khanda 8 — Boloji serialised paraphrase
The Agamas go further than the Purana: there is no separate Brahma. Creation is one of Shiva's five acts and is performed by his face called Sadyojata, so what other texts call Brahma is Shiva facing west and making the world.
Brahma is not an emanated being but a face and an action of Shiva.
Sources: Shiva Purana, Rudra Samhita, Srishti khanda 8 — Boloji serialised paraphrase; Trimurti — Wikipedia
The Maitri Upanishad names Brahma, Rudra and Vishnu together as portions of one being, matched to the three gunas.
The sage Atri and his wife Anasuya earn great merit through their conduct and austerity.
Vishnu and Shiva are shown as one figure divided down the middle.
A seven-metre three-faced bust fills the south wall of Elephanta's Cave 1.
Three Pallava shrines on one platform: Shiva in the centre, Vishnu on the right, and a disputed left shrine read as Brahma by Vogel but as Subrahmanya or Brahmasasta by later scholars; a Durga panel stands beside.
Brahma's body splits into a male and a female half.
Brahma grows a fifth head, and with it pride or a false word.
Brahma and Vishnu argue over which of them is greater.