Are there some default grid pattern textures in blender? I'm looking for a texture like this one:



Or the grid on the ground here:



Are those already implemented in blender internal? Or else in Cycles ?

I searched for "grid textures", "color grid textures" (on google) to get the images and apply them as image textures but I didn't find them.

Is it possible to generate them procedurally (in python)?
There are three grid pattern textures, or checker patters in blender.

Two are accessible only from blender's Image Editor when making a new image.

Those are the UV Grid and Color Grid
 

The other pattern is built in to cycles as the Checker Texture.