This is all of the amazing fanart that is on the wikia! Make as much as you please. BoneTheSandWing is certainly planning on doing some, since she has Adobe Photoshop and too much spare time.
What fanart do you need?Edit
There are plenty of pages that are missing some fanart.
What program should I use?Edit
Any program really works. I use Adobe Photoshop, since it has a lot of brush tools and layers, but it's also a bit complicated. Plus, you have to convert everything to .png,