As of a few days ago, we've activated the use of keyframing in Puppyray, making it fully animatable.
All the parameters in the filter can be keyframed, so you could, for example, animate the sun rising and changing colors.  I do believe it's also possible to animate the 'texture' in the swap image, so you could load in an AVI or something to use as an animated texture.

Keyframing in Puppyray is based on a new keyframing class added to Howler in version 9, so more keyframing could be possible in the future.