We've never had a blind up in the spare room as we always figured we'd wait it became a nursery and choose something appropriate for a child.
Lu found the fabric on Etsy and then Caroline found the manufacturer in Japan and then Lu finally found a supplier in the US, called Hawthorn Threads. The fabric is called Tiny Elephants in Ivory on Slate Grey. We had some mini pillows made up too, as you can see above.
The blind was made up by Milners in Ashtead who have made all our other blinds, and done a great job. I put it up today and it is going to tie in well with all the other elephant themed elements in the nursery.