Spray paint art is very easy all you need is a few materials and you can usually find those within your house. If you don't have some of the materials you get probably get them all for around $10. The place you'll be working in will need to be well ventilated so you won't breath in all the fumes. Depending on how big it is it shouldn't take long.
The materials you need are:
Those are all the materials you'll probably use. You also might want a paint mask and latex gloves. So let's get started!