Since this type of loose fill is much denser and therefore heavier than fiber glass or slag and wool, it sometimes may not be able to be used in attics since too much weight would cause the drywall ceiling below to sag.
Most are unpublished, many rescued from oblivion in attics and basements.
Raid your grandparents' attics or ask other family members if they've held onto patio furniture from eras past.
Scour friends' and family members' attics for one-of-a-kind retro pieces that have been collecting dust.
This is often the case for attics that are floored.