I found Robbie and Bobby, Lunarbaboon, and Blue to be pretty good examples of limited palette comics!
Also, I work on a comic, Espresso Inked, with a limited palette. Especially when I started out with only different shades of brown, like the one here.
Since then I tried to include similar colors, and usually don't use bright colors unless I want something to stand out.
...Then again, I'm no color expert, so I'm still figuring all this out!