I was sent this by Tonni: "Future Forests is planting a Joe Strummer memorial forest in the Isle of Skye in Scotland and anybody can buy their own trees in this forest by logging on to futureforests.com/joestrummer and have their tree planted. FF will then mail you back a special branded map and certificate. Joe's supporters, friends and fans can visit Joe's Forest and have a certificate as a memento of the tree we have planted for Joe. There will be a dedication list published on the website of all those who plant in Joe's forest."
This charity organization was very near and dear to Joe; in fact, it was "started around Joe Strummer's campfire at Glastonbury" and a donation to them would be a really nice tribute to his memory.