May need some touch up work but ok. Does not include the watermark (obviously).
Black and white:
black white and green:
black white and red:
black white and blue:
12x4 seems to be a good size for it.
As you can see any color can be incorporated although green seems to be the most appropriate.
Images may not be used or reproduced without my permission, thanks.
BTW if you need larger sizes and or different file types just contact me I will provide them if they are needed