Yellow paint

The rock bottom of depression makes things look REALLY strange. Yellow paint would not be the craziest thing I've ever thought might make me happy again.

Possibly

"It's just yellow paint man" should be an expression for things that people look for satisfaction in but can't find it. Who's with me

it's also sad cause he also only ever sold one painting... to his brother

There is a difference, since love and drugs changes your body chemistry in more than just a "toxic" way.