PaletteFX IS NOW FREE! Do you want to swap colors of sprites with ease?
PaletteFX is a set of shaders that let you do that and more.
Two modes are supported, 32bit and 8bit. 32bit lets you recolor parts of a sprite using a mask texture.
8bit more brings indexed palette texture support for Unity, allowing you to supply your custom palettes (or use one of the included palettes).
When using indexed palette textures, the textures don't store any RGB colors, but instead, just indices to a palette texture, which you can modify in real-time to make all kind of old school effects!
Also included is support for alpha dithered transparency, in order to obtain a more retro feel.

Try the WebGL demo here: www.lunarlabs.pt/assetstore