The "starfield" effect in the SQ6 startup menu is implemented with palette cycling. There are other uses of palette effects, some subtle, some not so subtle (QfG4 night palette for example). There are several new palette-related calls (PalCycle, RemapColors) and some extra subfunctions in PalVary that we haven't figured out yet. To find uses of RemapColors, you can scan the view resources for uses of a solid color (in GK1, it's usually bright red) with palette indices 236-254. When remapping is enabled, these colors overlaid on something else transform the underlying image in some way (gamma adjustment for sunbeams, transformation to greyscale, translucency and one or two others).