Then it's just a simple matter of choosing your grid size and setting position:
For example a 32x32 grid.
Set Sprite to 32*Width, 32*Height
Taking into consideration where in your layout the grid starts, you should add these values to the Upper Left Corner of the grid.
Now whether the words 'Width' and 'Height' are usable for global/instance vars is a whole other story.
You could also try out Rex's grid plugins but I have no experience using those.