I need some ideas on what to use to make the loose marijuana.

also how should I go about making the leaves ? 

any other helpful ideas to add to the cake ? 

Lololol, I haven't a clue, but I gotta say, much has changed in our world in 35 years--pot is totally mainstream!!! And to think my grandma thought Elvis was corrupting young Americans.   

Just thought of something for leaves...a Japanese maple leaf cookie cutter may give you the shape you need.  I have Japanese teacups with the Japanese maple leaf imprinted, and everyone mistakes the leaf for marijuana leaf.

It looks like it's freehand cut with an xacto knife and use a clay sculpting tool to create the indents. Also, I just saw a thing about grated fondant. Like freezing a piece of fondant (in your case, green) and grating it. Maybe that can help create the loose marijuana effect.