Garudapurana 3.12.66

3.12.66

pañcadhātumaye kṛṣṇe harirūpavicintanam /
svayaṃ vyaktasthale cāpi cidā nandatvakalpanam //

conceiving the form of Hari in a Kṛṣṇa made of five metals;
or imagining the nature of consciousness and bliss in a self-manifested place;