Cthulhusaurus rex?

I'm not quite sure what to do with this image, but it's so cool, that I oughtta be able to think of something!

The old "pseudonatural template" applied to a T. rex seems a little pedestrian.  Then again, that's pretty much what it is, I suppose.  I've gotten away from the fiddly details of d20 creatures and templates, but mining the data there is probably fruitful even if applied to a stripped down m20 paradigm.