Allegorithmic released a free animated loop able caustics map. In Cg caustic can be generated using a render engine supporting Global Illumination, this will however raise your render time from minutes to hours. Allegorthimc used Substance to create a real-time dynamic and animate able caustics map which can be used to fake caustic generated from a pool or ocean. This map can save you hours of render time and the end result is really impressive.
The caustic map is available for 3DsMax 2012 as well for Maya 2012and you can download it together with Substance Player like a package. The video bellow demonstrates the power of this map.
Source and full article: Allegortihmic