What you do is lightly draw squares with a pencil and then just color in the squares that you have drawn. This is a simple at home diy project. You decide what size you want the canvas to be then just set up your painting area wherever you want it to be.
Create large, custom pixel-inspired artwork on the cheap using a simple plywood or medium-density fiberboard (MDF) panel and crafts paint. Arrange crafts paint in the same color palette from light to dark.