Recently I took part in an international Sketchbook Relay; just sent the sketchbook on to the next person TODAY, as a matter of fact!
Happy to be asked and had a good time creating the page -- one of the fill-the-page things I enjoy doing, with obvious "sketchbook-y" words and imagery. Black marker and a warm grey colored pencil.
If you'd like to learn more about this effort, here's a link to the Facebook page that shows the artwork, where in the world the ten traveling sketchbooks are, etc.
After returning home to the UK, the sketchbooks will be auctioned off and the proceeds will go to a to-be-named charity.