Couple of ways to do it. You can download GIMP, they have alot in the way of online howto's to help ya along. Don't get me wrong, it can be a bit of a pain at first. Another is just plain old Paint. If you don't mind demo's you can DL Photoshop and use it for 30 days. What's the picture you want for your nose art? I can try to throw something together for ya.