I haven't seen the green Mickeys in the parks for sometime. I think 2012 was the last time I attached one to our park bag. We used to get them in the paint department at Home Depot, but no longer. As I recall, someone over on the DISigns board created green Mickey heads that I printed out.
Occasionally I will see posts where Disers make arrangements to meet up in the parks, but I do miss seeing those Mickey heads, so much fun!