Get FREE ProPalette. This plugin is pretty good for the one looking for Color Selection Effects.
ProPalette allows users to identify and seclude a color of their choice and make adjustments on a particular scene. The plugin comes with over 70 presets that can integrated with Final Cut Pro X. Playing around with the colors is easy with ProPalette; there are endless effects depending on your creativity. Some of the basic effects are; color softness, color levels, color matte levels, black and white gradient colorization, and black and white levels. All these can be achieved on click of a mouse.
Pixel Film Studios: ProPalette [Free download]