Greetings!
Yeah, mmadsen my friend, I have changed the descriptions of a good number of creatures and races. For example:
(1) Ogres! My Ogres are very different from the MM Ogre. I have developed a full write up of their culture, physiology, society, psychology, and religion, that are all distinctively different from what is in the MM. I can post it if anyone is interested.
(2) Elves: My elves are very different from what is in the MM. As noted in my culture post about changing cultures, my High Elves average 6'-7' feet in height. They are highly magical, and significantly more powerful than a typical human. I think I EL them at 4. Wood Elves are 5'6"-6'6" in height, and are magically powerful in different ways.
(3) Beastmen: My Beastmen have many different attributes, with bizarre inhuman, animal, and monstrous mixtures. They worship the Dark Gods, and are more arganized and fanatical than anything in the MM.
There are perhaps many more, but these are some examples from my campaign.
Semper Fidelis,
SHARK