It's unfortunately not a print, it's a vintage fabric remnant that we had stretched onto a frame. We found the fabric at a store in Toronto called Ethel; they specialize in mid-century modern gear.

Thanks! That print is from a UK firm called It's Pop It's Art - www.itspopitsart.com

Thanks for everyone's kind comments, it was a lovely suprise to find out our place had appeared on Apartment Therapy! Those Ikea bookcases were unfortunately discontinued not long afte...