Heleen (the Netherlands) sent me this nice drawn envelope with matching stamps. The once with the red and white cups were issued in 2003, but I hadn't seen them before (I think). They are dedicated to the 250th anniversary of Douwe-Egberts Coffee Roasting founding.
Inside there was a folded card encouraging us to drink wine and beer... or, anyway, not to drink water.
So, I considered coffee to be a good option, and made two postcards for Heleen, out of a calendar from my coffee store.
More reused materials: a collage I made for Laura (the UK), of Belgian chocolate packaging.