When I was reading mistborn I decided that I wanted to practice my accent impersonations. So I just kind of threw out random accents for almost all the characters and read out their lines(when I was alone, of course).
Vin and Kelsier I just couldn't finda good accent so I just stuck with an american accent(I speak with an american accent even though I'm not american. Weird, I know.)
Dockson got Australian. No idea why.
Sazed originally had an Indian-inspired accent, but I just wasn't feeling it with him so I dropped it.
Breeze had a posh British accent. Seriously though what other accent can you give him?
Ham also got the short end of the stick and was american.
Clubs was Irish.
OreSeur/TenSoon became Scottish. One of my favorite accents. His scenes in HoA were so much fun because he had so much dialogue.
Anyway, it was a bunch of fun. I don't really do this kind of thing anymore, but I still try to figure out what Wayne sounds like in all of his different accents. Most of them are British-based. Most similar to Cockney.
I also automatically hear a Russian accent whenever Rock speaks, but my Russian accent is horrible, so I don't usually read his lines out.