Envelope designed with pen and ink by Rael Mail, The Netherlands. I googled for Rael's name and found one more example of his (her?) artworks on envelopes at Mailartist.com - http://www.mailartist.com/kiyotei/envelope02.html
. It was amazing to compare and to see the great difference between this envelope and the one received by Kiyotei in 2005 or earlier.