Those of you making mirth of the vegemite cult might want to back off a bit, it's a real religion in this part of the world. This board has strict rules regarding making mock of people's belief systems.
Seriously, in terms of an actual cult for a game I can see bugs working. Not moths, despite the evidence provided above. But termites, ants, bees and other hive types. And nasty ones like wasps and spiders and scorpions. OK, spiders reaks of Drow but this can still be good.
Must be folks here who remember the old Shadowrun adventure based around bug cultists. (can't think of its name.) Eggs getting implanted in people that release weird spirits that, when they hatch, warp the hosts into monsters. I'd also recommend an old novel by Frank Herbert, 'Hellstrom's Hive' for a cult of bug worshippers. Good stuff there for the stealing. Er, I mean paying homage to.
now I must go have my afternoon vegemite toast.