Simple:
* The old house was filled with a phantasmal chill, as if the ghosts of its former occupants were still there.
* The musician's performance was so captivating that it felt like a phantasmal dream.
More complex:
* The phantasmal images of the war flickered across his mind, leaving him shaken and disoriented.
* The artist's brushstrokes created a phantasmal landscape, blurring the lines between reality and imagination.
* The ancient city ruins were shrouded in a phantasmal mist, hinting at the lost civilizations that once thrived there.
* The poet's words conjured a phantasmal world of longing and despair.
Figurative:
* His memory of their love was now a phantasmal echo, fading with time.
* The city's nightlife was a phantasmal blur of lights and music, leaving him feeling strangely disconnected.
Remember that "phantasmal" emphasizes the ghostly, dreamlike, or unreal nature of something. It's often used to describe things that seem to be there but are not, or to create an ethereal atmosphere.