Started as a test to discover some new Octane features in Blender, ended up making some overlay effects.
I get asked about this a lot and once again; Octane for Blender is free and can be downloaded here: https://render.otoy.com/forum/viewtopic.php?f=7&t=72241
All the vellum and pyro simulations are done inside Houdini.
These are also available for sale here (https://www.shutterstock.com/video/clip-1089287849-overlay-effect-pirate-theme-transparent-background-that) with alpha channeled backgrounds and perfect loops.
Models are mainly from Polyhaven.com and 3dexport.com