Possibly The Original Phenomenon of worship, and still very popular today though I still am quite mystified; FIRE!!!
Grossly appropriate, I know.
Customized Lighters and Match booklets, mini match statues and SKULLptures, firewood for those who have a burn barrel/spot, maybe gas for stoves, some dangerous hat that involves an open flame. obviously poi and fan dancers. too bad we have to consider safety... or I'd bring some magnesium.
also a substantial burn barrel/device ala LNT, for people to gather for prayer to this Mystic Life Giving, HotAir Liquid that can't be anything less than intergalactic.
Such a broad idea about fire at Burrning Man, and i didn't once worry about any of it being done before! Savannah aren't you proud!!!
Let us not rail about justice as long as we have arms and the freedom to use them- Duke Leto Atreides