Finally got time between Uni modules to work on a course, just finished the Spooky Corridor section of the Environment Course. Added a small addition of green hazardous Goo from a fallen barrel, created with a quick paint sketch of a blob and applied it to a plane, and in the Shading workspace, used an RGB node, Distance node and plugged it into a Mix Shader, along with a Transparent BSDF to remove the white sections from the plane, keeping only the green blob
Edit: Added new render after suggestions from NP5 & NumbNong