There are currently no banners but if you are good with photoshop please feel free to help me out and make some for me! All credit will go to you!
I can probably make you a decent banner for free :3 (with credit please, as you said, so more people can see my work and purchase from me).
portfolio: http://minemash.minus.com
I mainly make minecraft banners, but I'm alright with photoshop.