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.
This is my idea of the perfect outdoor area. I have a small balcony and this would be divine at my place. The hanging lights can be bought from IKEA, they are solar lights which is so handy. I absolutely love this! With the cat!