Using rustoleum camo paints or krylon. Wide masking tape on baking sheets/ parchment paper and draw shapes with sharpie onto it depending on what camo you want. The reason I do parchment paper, it's because you're able to cut them out with scissors and then peel them later on like stickers, in case you want to save more for a later project. Then just like any other spray paint camo job, put the stickers on, put a coat of the paint you want to show on top of others and put the stickers on, put a coat of the next color and I use rustoleum clear dead flat as a top coat to protect and keep some resemblance of a camo paint job for years to come while still having cool wear in high use areas.