Creating your own monsters in D&D can be a fun way to creating flavor for your game that is unique to it. The process I use for making a brand new creature is called templating.
I love the move tremors, lets say that you wanted a monster like the tremors monster for you game. Now you have two options. One see if there is a monster like it Two make your own. There actually is a monster very similar to the tremors creatures called the purple worm, but for the sake of this article lets assume there isn't.
More after the bump