I like using the levels, it's under Effects. So you can drag an effect from the Effects Pallet under Video Effects and, I think, Adjustments. It has slider adjustments that will deepen the darks and mute the lights. You could also adjust the Saturation, should have a slider for that under the same Adjustments options, and pull some of the colors out. You'd wind up with strong darks and muted colors, could be an interesting effect.