For the past 15+ years, I've been using LEGO minifigures in place of more traditional role-playing miniatures. During that time, I've also built a number of LEGO miniatures for creatures that were non-humanoid or were significantly larger or smaller than humans.
This purple worm represents one of my more recent and complex attempts. It's based on the illustration in the D&D Monster Manual, and is designed to fit D&D miniature scale (1 inch = 5 feet).
This is my second attempt at a purple worm. For my first attempt (last photo, below), I lacked properly colored bricks. This new model was inspired by my acquisition of several dozen purple parts (mostly from Two-Face's car and Ninjago skeletons' vehicles).