Tabby Cat Fabrics, appropriate name have many mottled effect fabrics in, blues, blacks and greys which would work well.
This subtle paw could work, but its in the US
So I am no nearer finding a solution so I will end with these I founds that are cool
Found on an old blog post www.blisstree.com. I now have visions of a big yellow duck quilt!
Like these maybe;
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