TMNT: A Fistful of Turtles by Mike McMahon

This is a very late entry, and they're just sketches. I did them about a month ago but forgot to post them.

Xmas NInja Turtle by Rob Ayotte

Two Birds...

TMNT: Elder Leonardo Ninja Turtle Santa by Josh Purple

Sure, why not :) ! 

TMNT: KRANGed, by Josh Lynch

I always loved Krang's design.  Him and all the Dimension X stuff was always my favorite as a kid.  Krang has a bit of Kirby flair to his design.
Here's an extra turtle sketch
And one of master splinter