On the topic of bloom, depth of field, and sky, some options are: you can create instances and insert them into the lighting via a localscript,or you can have them all pre-made and stored within lighting (but disabled) and they’d be enabled.
You can choose how you want the bloom, depth of field, and sky to look by inserting these into lighting within studio and experimenting with the properties! Then, have the client tween or change the values of the effects to these properties.
Personally, I would just pre-make all my lighting effects and just enable/disable them.
On the topic of inverting colors, this interesting community tutorial thread seems to share a very simple method of color inversion (to stack two ColorCorrectionEffects within lighting with -1 saturation)