Fuzzy dice were popular in the late 50's, early 60's. I remember them well, and even had some, but I can't tell you exactly where the idea came from. During that time, most of the "fads" started in California, but who came up with them I don't know.
Not much help, but I don't think anyone was really responsible, just a fad, like Lake Pipes were during the early 50's.
Marc