For Mixed Media.  Experiment with additional techniques. This was done on Celluclay, mixed with green tea, and dried in the oven at 200* for 2 hours.  The green tea gave the paper a nice tint and I like the way the tea leaves are embedded in the "paper".
It is super fragile.  As I was peeling off the aluminum foil, the edges cracked off, then as I was painting on the "paper" more of the edges cracked off.  If I was to do this again I would make sure to make the "paper" thicker as it seems to be a bit more sturdy.  My husband thinks it looks like a giant potato chip :) 
The one on the left is thicker.  I painted on the thinner one as the thick one wasn't dry.