Why buy miniatures when you can build your monsters out of bricks? Brick Monsters is a combination of a monster manual and building instructions. It provides two different builds for the creature and monster stat sheets for 3.5 and 5th edition. Instructions are provided in pdf along with a zip with ldraw files.
Everyone's favorite trash eating monter comes to brick form. The yellow and reddish colored otyugh is based on an old bendy toy while the other build has more accurate colors to the monster's description.