@jewelz read this https://kaminskyblog.com/2018/10/31/how-to-patina-a-bronze-dive-watch-at-home/
There is a link to a blue patina for brass. You could just speckle it on by flicking a brush or something creative like that
There is a link to a blue patina for brass. You could just speckle it on by flicking a brush or something creative like that