Some friends asking me about how do I make my origami looks like rusted metal, actually it's quite easy. First you need an origami that made with dark color paper, better with black paper, a small brush and gold/silver enamel paints. Just take very little amount of the enamel paints and make your brush 80% dry, let the tissue paper absorb most of the paints before you paint on the origami, and then painting from the edges to the body, done ! Here's some suggested combinations of the enamel paints and paper color :
Copper = gold + brown paper
Steel = silver + black paper
Bronze = gold + green/blue paper
etc.
