Comic book action bubbles are a simple way to spruce up your nails, using a white base and colored polka dots on top, you can add pizzazz by creating zig-zagged and imperfect speech or action bubbles outlined with a thin-tip black polish. Write your words of choice like 'Splat!', 'BAM!', 'Pow!' and 'Zap!' or whatever other fantastic word you can think of!
Another graphic idea is to do a heart on your middle finger with a simple heart-shape and then a cardiogram line drawing on the rest of the nails with a black fine-tipped brushed nail polish. Keep your background color a simple pink or red but make sure that your heart can stick out with a more saturated color.
If you don't want to choose one particular superhero over another one, because you're just such a huge fan of them, take all of the iconic symbols from their outfits and incorporate them in black over different colored base nail polishes. Notice how the background colors are representative of each particular hero, for example, Batman's colors are black and yellow while the Green Lantern's colors are green and black.
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Tools you can use to create these looks can be found here: