All I know is that a friend has a small Tiffany box; and it's a lot more "green" to my eyes than just a light blue. Could be my limited "artistic ability".
We took her box and searched the big box stores; Michael's, A.C.Moore and Hobby Lobby. We found a really close match at Hobby Lobby but I don't know the manufacturer. Could have been HL's "house" brand if there is such a thing. We were in a hurry and only needed a few sheets so shopping locally rather than online worked for us.
If you google "tiffany blue paper" you will come up with some online places that carry it.
Mary in NC