Churches can have very ornate windows or just colored glass panes in the window frame. It depends on how much the church was/is willing to pay for the windows.
It is beautiful at night when the lights are on inside the church and you can see them from the outside. I love to visit churches and walk through the Sanctuary and take in the beauty of the windows. Each church has its own windows that tell their story.
Next time you get a chance to really look at the windows in a church, imagine them being made, who them makers were and how long they have been hanging in that church.
Have a beautiful week.