V&A has some in its Textiles collection, but no image - here you are!
http://www.youtube.com/watch?v=YLgW0wNVkLY evocative view of a recent exhibition of the Days' work, too. Thank you buscadavideo
http://jocelynwarner.com/jwblog/ - lovely blog with so many other wonderful designers' work, thank you Jocelyn.
And just seen this bit in the Guardian's Obituaries.
Recommended listening: Bill Evans' "Midnight Mood"