P14 may have automated gobos, but you could simply use a JPEG (or movie) on a plane before;  this is circa P12:

My scenes, using a gobo plane and an infinite light:  

     The caustic image is seamlessly tiled and seamlessly looped (made with Genetica Studio).

The geometry:

All Superfly renders.

Poser 12, Poser 13, Poser 14, in feet.  

OSes:  Win7Prox64, Win7Ultx64, Win11

Silo Pro 2.5.6 64bit, Silo 2025.1, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5