Don’t think that adding lights to your toe-kicks is a frivolous aesthetics-only decision. Strip lighting at the underside of base cabinets is a great way to create a night light that looks fabulous.
If you are adding new pendant lighting but don’t want to deal with the expense or hassle of changing your home’s electrical setup cord swags can be a stylish solution. Swag them loosely over a bar or a hook as seen in this kitchen or secure the cord tight to the ceiling for an industrial look.
In a renovation on the other hand we have to consider what effect a new skylight will have on the efficiency of the existing building. In some cases the additional sunlight (and therefore heat) can help reduce the amount of energy needed to heat the house. It depends greatly on the local climate but also on the design of the building envelope of the house.