It's hard to tell for certain from the photo, but the bird tracks look like cutouts. If that's so we'd love to see a version in which the tracks are simply a felted-in or woven-in pattern, since cutouts often become little traps for dust and dirt.
Still, what a charming idea for a surface pattern. It would be easy to replicate with a paintbrush, and might be even more charming on walls, windows, or ceilings.
Wilson's rug comes in four standard colors (olive, bright green, earth brown and turquoise) and two irregular sizes. The large costs £280, about US$555.