Put down a drop cloth to protect the floor.
Paint the walls using the lighter iridescent paint using a paintbrush and allow it to dry completely. This may take several hours or even a full day.
Apply a thin coat of the darker iridescent paint to a 5-foot segment of the painted wall using a paintbrush. Paint only a small area to ensure that you can work with the paint while it is wet.
Wipe swirls into the wet top layer of paint using a squeegee or a clean rag, moving the object in a circular motion. While the paint is wet, the squeegee or rag can remove sections of it cleanly. Be creative and make irregular swirls in the wet paint. The motion of the squeegee or the clean rag removes the top layer of paint, revealing the bottom layer underneath.
Repeat Steps 3 and 4 throughout the room.
Allow the paint to dry thoroughly.