It reminds me of the 1970s or 1960s in the U.S. where big and very staid companies created ad campaigns with those goofy flower stickons. (See below)

And then on the website designer's page www.rustydogg.com you've got his "hey, man, I'm bud friendly" page with a picture not of marijuana but a tree that has leaves in a similar shape.  Check it out: