Turtle Mob Statues at both a 1 pixel : 1 block and a 1 pixel : 2 blocks scale. The download also includes schematics for the pregnant turtle as well as turtle eggs.

Check out a short clip of the build here.

Since the block color palette is somewhat limited the statue doesn't look exactly like the turtle mob. Therefore, I created a turtle skin that uses the available block palette and looks more like the turtle: check it out here!
Feel free to download and use the statues however you like, but please give credit if you do :)

Check out my Mob Statue Collection for more builds like this!