That second Bones one...it's a really interesting effect. The figures look sharpened, and there are very subtle white outlines here and there, around their heads. Kinda makes them look like flat, cutout figures—yet adds depth to the overall scene. I love the weird illusions you can get with photoshop.
And I like that you're always using kind of a...duotone look—reds and greens, blues and beiges, what have you...