I'm looking to create a church/cathedral style building in my world in the midst of my pale/dark oak custom forest I'm building. I'm trying to come up with an idea and understanding of how stained glass gradients work. I'm contemplating an idea of having the color scheme of the building be a dark grey/black pallette using blackstone and deepslate, mixed with diorite and calcite for pops of white color. For my windows I'm trying to determine if I want a light grey and red gradient, or blue and white gradient.
My primary issue however is that to try and properly get this to look good, do I space the glass with empty air between layers of glass, or stack it directly against each other? And in addition to that, should panes or just straight glass blocks be used? Can anyone provide some help or guidance?