paint thinner on a file cabinet - taking it down to its natural metal jmoinajo edit: I did this before and really liked the look. wait to seal it, and you will get strange rust patterns from humidity. Seal with a clear gloss as soon as you like what you see.
Polymer clay soaked in paint thinner turns into a product resembling paint. This can be used as a resist for collage. It can be painted onto paper, glass or a tile and baked, resulting in a flexible translucent sticker