Is there an easy way to add grid lines to a layer so I can import them into Unity?

I am using Tiled2Unity and I would like to easily add the grid lines. I am trying to build a 2D RPG and I want to have grid lines on the map.

Thoughts?

Not sure if this is the best way. But I used a plugin for paint.net that adds grid lines. I simply made a grid of 1024x768 in paint. Made sure it was on a transparent background. Imported the grid in as a tileset with size 1024x768. Dragged it into its own layer … BAM!