Form Grows Rampant is the debut release by Peter Christopherson's solo project The Threshold HouseBoys Choir. The set is a CD + DVD. The album was originally announced in the X-Rated: The Dark Files as Rampant. The set was originally planned to be released in Blu-Ray format. The DVD portion of the set includes documentary footage directed by Peter Christopherson from a vegetarian festival in Krung Thep, Thailand. He has used the video footage during his live performances since the debut concert in Russia. An alternate version of "So Young It Knows No Maturing" appears on X-Rated: The Dark Files. "As Doors Open Into Space" is a remix of the song "Mahil Athal Nadrach" from the compilation ...It Just Is.