I use the World's Best Cat Litter, which is the corn-based stuff, but I'm actually looking to switch because of the dust and tracking. So no insights from. But could you share where yo...

No idea as to the designer, but dear Lord, what a killer find! I'd love to see more photos of how, exactly, it hinges.

I'd stencil or decal them with one or two large-ish graphic elements. Maybe some kind of flocked or floral design, or alphabet letters spelling something out across the two seats?