Unity Grid Patterns

Hello, I was working on a puzzle game that utilises grids, similar to Bejeweled. I need an algorithm that will fill the cells with 2 textures. For example, the starting cell will have a dark texture and the one next to it will have a light texture. Just like a checker board.

I tried with a forloop with no success and if you want me to post it, I am happy to.

 

You could do a for loop where every cell has a distance of 2. The white cells would start at Vector2(0, 0) coordinates and the black ones at Vector2(1,1).