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So i want to go with an old diving suit look brass with aquamarine blue as the alternate colour for convergence of cyriss, but the ultimate hindrance to that is my inability to add barnacles and seaweed to anything i paint.

I was thinking of doing something similar to one of the Warmachine warjacks.
My idea was to use crepe / tissue paper (you can get small samplers with multiple colours for not much $£), cut into strips then pull through some watered down white / wood / Elmers / PVA glue. Use greens, browns & greeny blues rather than just one colour.
The glue should give a shiney finish & stiffen the paper once dried.
As for barnacles, try little blobs of green stuff & poke the centre with a tooth pick?

It is worth a shot, the crepe sounds easy, same with the green stuff. I am sure i got a model around here somewhere that I can use for testing.