If you are searching for high-quality "halomy" paper, you likely mean or vinyl. This specialty material has a reflective surface that shifts colors based on light.
While "Halomy" is not a widely known individual prankster, it is associated with high-quality holographic projection equipment used to create realistic visual pranks. For example, the MIGO Prank Hologram Screen
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Based on the trending nature of the search "halomy prank high quality," this likely refers to Vladimir Shmondenko