So would these gobos, or whatever they're called, include effects like casting light reflecting off water in a window to suggest that the set is on the seaside? I noticed this on one of the regular sets of an old show that I've been watching.
Aside from the light rippling effect which is done as Maurice suggests (since they don't actually go and build a set seaside in order to get the effect), cucoloris come in all kinds of different stencl-like patterns to get the lighting effect desired. I.e., the lighting team doesn't actually need to set up a chain link fence if they want the effect of light shining through a chain link fence:


