You have made a decision to embark on creating a masterpiece with your child. First piece of advise is don’t rush it, when they get into drawing they might be really slow, but they will be thinking about all the details you will not have thought about. They can do each person on a different sheet of paper, get the children to write the names and date & year.
You now get to choose the background colour. Generally I would choose a colour that isn’t used much in the drawings. Or if you have a particular colour that you like or might suit your interior, see if you can take the colour away from the drawing table so your child won’t use it too much.
Below are the colours and their names, in the product page you have a pull down menu where you can choose the colour.